User blog comment:SpookyBoogie27/Light Novel Spoilers/@comment-33447191-20130118201121/@comment-33447191-20130120085444

Additional information:

 Sona's Group powerups:  ''' -Two additional members; Rugal and Bennia.  Loup Garou'''(Rook) is a college student of Kuou Academy. He is called Rugal by others. He has good build, and has ash hair color. Loup Garou means "werewolf" in french. Bennia(Knight) is a half Grim Reaper. Her mother is human, and her father is a Ultimate-class Grim Reaper, Orcus. She left home because she didnt like the ways of Hades and her father. Originally the [Knight] Sona set eyes on couldnt become Sona's servant, so she stepped in to become her servant. She wasnt seen as a threat or a spy of Hades because she is a big Oppai Dragon fan.  -Artificial Sacred Gear:  Sona's servant who doesn't have a Sacred Gear was given an artificial Sacred Gear from Azazel. Yura(Rook) was given "Twinkle Aegis". Meguri(Knight) was given "Blazer Shining or Darkness Samurai-sword". Momo(Bishop) was given "Applause Wall". Kusaka(Bishop) was given "Scouting Persona". Nimura(Pawn) was given "Procellarum Phantom".

Full names of members of Sona's group that hasnt been revealed is now revealed: -Sona Sitri (King) -Shinra Tsubaki (Queen) -Yura Tsubasa (Rook) -Loup Garou (Rook) -Meguri Tomoe (Knight) -Bennia (Knight) -Hanakai Momo (Bishop) -Kusaka Reya (Bishop) -Nimura Ruruko (Pawn) -Saji Genshirou (Pawn)

 Mephistopheles  He is from the same generation as the "Old Four Great Satans". He is a Liberalism, so he didnt get along with the previous Satan. He wasnt interested in Rating Game, so he didnt give that much orders to Tannin. He also has a longinus possessor as his servant as well.

 Others  Because Azazel retired, he broke his pact with Fafnir. Azazel then made Asia make a pact with Fafnir.

Also it seems like the Evil-Dragons will be stronger than the Dragon-Kings.

Raiser contacts Issei (not Ravel) sometimes.

Xenovia and Irina will be having an argument about "Babies".

Xenovia started training with using the 7 abilities of Excaliburs after being lectured by Millicas in Volume 13.

Grendel is a psycho dragon and he stands up numerous times even if he was taken down by a dragon-slayer

Irina apparently made some kind of promise with Issei when he was a kid. Its hinted that it might be marriage......

Volume 15 will be short-stories but will have a story about Kiba's past as additional story.

Volume 16 will be Gasper main story. - (Info. from Code-Zero/n0m@n or Shin Code-Zero)