We can't really do more than speculate at this point Stateofgreen. I'm afraid I don't think there will be such a commentary though.
Complete list of extras compiled from different sources:
SINGLE DISC DVD¤
The Chronicles of Narnia: The Voyage of the Dawn Treader in High Definition (112 min 33 sec)
¤
Audio Commentary with Director Michael Apted (1 hour 48 min)
¤
Deleted Scenes (5 min 35 secs)
- Deleted Scene 11 – The Kids in Narnian Clothes (28 sec)
- Deleted Scene 14 – Eustace is Ill (37 sec)
- Deleted Scene 65 – Mutiny (2 min 12 sec)
- Deleted Scene 90 – Caspian “Doubt” (47 sec)
¤
Seasick Gag Reel2-DISC SPECIAL EDITION DVDDISC 1¤
The Chronicles of Narnia: The Voyage of the Dawn Treader in High Definition (112 min 33 sec)
¤
Audio Commentary with Director Michael Apted (1 hour 48 min)
¤
Deleted Scenes (5 min 35 secs)
- Deleted Scene 11 – The Kids in Narnian Clothes (28 sec)
- Deleted Scene 14 – Eustace is Ill (37 sec)
- Deleted Scene 65 – Mutiny (2 min 12 sec)
- Deleted Scene 90 – Caspian “Doubt” (47 sec)
¤
Seasick Gag ReelDISC 2¤
The Secret Islands: The Untold Adventures of the Dawn Treader - An Animated Short (6min 57 sec)
¤
King Caspian's Guide to the Dawn Treader: Legends and Lore of the Great Ship (?min ??sec)
¤
Island Explorations (3 min 35 sec)
- “The Lone Islands” (35 sec)
- “Magician’s Island” (35 sec)
- “Goldwater Island” (43 sec)
- “The Dark Island” (49 sec)
- “Ramandu’s Island” (51 sec)
¤
Narnian Discoveries: Friends and Foes of Narnia (6 min 12 sec)
- Reepicheep (1 min 2 sec)
- Aslan (54 sec)
- Tavros (43 sec)
- Dragon (47 sec)
- Dufflepuds (53 sec)
- Liliandil (44 sec)
- White Witch (29 sec)
- Great Sea Serpent (35 sec)
¤
The Chronicles of Narnia: The Voyage of the Dawn Treader (“Evergreen w/Bug”) (9 min 5 sec)
¤
Direct Effect – Michael Apted (6 min 21 sec)
¤
In Character with Liam Neeson as Aslan (5 min)
¤
In Character with Georgie Henley & Will Poulter as Lucy Pevensie and Eustace Scrubb (5 min 14 sec)
¤
The Epic Continues (2 min 4 sec)
¤
End Title Songs from Around the World (26 min 56 sec)
- Victoria S. – “There’s a Place for Us” (3 min 54 sec)
- Sonohra – “There’s a Place for Us” (3 min 51 sec)
- Joe McElderry – “Someone Wake Me Up” (3 min 34 sec)
- Sergey Lazarev – “Instantly” (4 min 11 sec)
- Stan Walker – “Stand Up” (3 min 41 sec)
- Xander De Burisonje – “There’s a Place for Us” (3 min 53 sec)
- EMD – “There’s a Place for Us” (3 min 49 sec)
¤
Music Video: “There’s A Place For Us” (Carrie Underwood) (59 sec)
¤
VFX Progression Reel (12 min 58 sec) (with optional commentary by Michael Apted and Mark Johnson)
3-DISC BLU-RAYDISC 1 - BLU-RAY¤
The Chronicles of Narnia: The Voyage of the Dawn Treader in High Definition (112 min 33 sec)
¤
Audio Commentary with Director Michael Apted (1 hour 48 min)
¤
Deleted Scenes (5 min 35 secs)
- Deleted Scene 11 – The Kids in Narnian Clothes (28 sec)
- Deleted Scene 14 – Eustace is Ill (37 sec)
- Deleted Scene 65 – Mutiny (2 min 12 sec)
- Deleted Scene 90 – Caspian “Doubt” (47 sec)
¤
Seasick Gag Reel¤
The Secret Islands: The Untold Adventures of the Dawn Treader - An Animated Short (6min 57 sec)
¤
King Caspian's Guide to the Dawn Treader: Legends and Lore of the Great Ship (?min ??sec)
¤
Island Explorations (3 min 35 sec)
- “The Lone Islands” (35 sec)
- “Magician’s Island” (35 sec)
- “Goldwater Island” (43 sec)
- “The Dark Island” (49 sec)
- “Ramandu’s Island” (51 sec)
¤
Narnian Discoveries: Friends and Foes of Narnia (6 min 12 sec)
- Reepicheep (1 min 2 sec)
- Aslan (54 sec)
- Tavros (43 sec)
- Dragon (47 sec)
- Dufflepuds (53 sec)
- Liliandil (44 sec)
- White Witch (29 sec)
- Great Sea Serpent (35 sec)
¤
The Chronicles of Narnia: The Voyage of the Dawn Treader (“Evergreen w/Bug”) (9 min 5 sec)
¤
Direct Effect – Michael Apted (6 min 21 sec)
¤
In Character with Liam Neeson as Aslan (5 min)
¤
In Character with Georgie Henley & Will Poulter as Lucy Pevensie and Eustace Scrubb (5 min 14 sec)
¤
The Epic Continues (2 min 4 sec)
¤
Good vs. Evil: Battle on the Sea (BD Exclusive) (10 min 53 sec)
¤
Portal to Narnia: A Painting Comes to Life (BD Exclusive) (7 min 20 sec)
¤
Unknown third BD Exclusive Featurette (? min ?? sec)
¤
End Title Songs from Around the World (26 min 56 sec)
- Victoria S. – “There’s a Place for Us” (3 min 54 sec)
- Sonohra – “There’s a Place for Us” (3 min 51 sec)
- Joe McElderry – “Someone Wake Me Up” (3 min 34 sec)
- Sergey Lazarev – “Instantly” (4 min 11 sec)
- Stan Walker – “Stand Up” (3 min 41 sec)
- Xander De Burisonje – “There’s a Place for Us” (3 min 53 sec)
- EMD – “There’s a Place for Us” (3 min 49 sec)
¤
Music Video: “There’s A Place For Us” (Carrie Underwood) (59 sec)
¤
VFX Progression Reel (12 min 58 sec) (with optional commentary by Michael Apted and Mark Johnson)
DISC 2 - DVD¤
The Chronicles of Narnia: The Voyage of the Dawn Treader in Standard Definition (112 min 33 sec)
¤
Audio Commentary with Director Michael Apted (1 hour 48 min)
¤
Deleted Scenes (5 min 35 secs)
- Deleted Scene 11 – The Kids in Narnian Clothes (28 sec)
- Deleted Scene 14 – Eustace is Ill (37 sec)
- Deleted Scene 65 – Mutiny (2 min 12 sec)
- Deleted Scene 90 – Caspian “Doubt” (47 sec)
¤
Seasick Gag ReelDISC 3 - DIGITAL COPY¤
A Digital Copy of the FilmNOTE: I've decided not to include "Reepicheep's Guide to the Dawn Treader" as I believe this is the same feature as "King Caspian's Guide to the Dawn Treader: Legends and Lore of the Great Ship" under a different name. Wouldn't make any sense to have two different guides, but I might be wrong. I've also decided not to include "Adventures of Reepicheep Story Extension" at this point as I have a feeling this is the same thing as "The Secret Islands: The Untold Adventures of the Dawn Treader - An Animated Short" but under a different name.
Sources: Narniafans, Aslan's Country, Filmonic and the BBFC