I reaaaally hope Moria isn't going to be left out.
Post-TS Straw Hats
Shanks
Law
Kid
Drake
Vivi
Wapol
Eneru
Lucci
Caribou
Koby & Helmeppo
Hodi
Shiki
Doflamingo
Marco
Smoker
This would bring us to 44 total characters
If we have 48 total, then I would most definitely assume Moria to be a playable character. The one thing that concerns me is that his sprite in Gigant Battle 1 had him lying down and couldn't easily be turned into a playable character. They'd have to redo Moria's sprite entirely. It would certainly not be unreasonable but I fear that laziness may be the reason for Moria's exclusion.
Then again there should be room for 48 total characters based on 24 characters per page….Moria and 3 others should be in. Hyozou may be a playable character....but Zoro did break his swords last chapter. I don't know if he'll really be as strong an adversary as we think. Guess time will tell. If Hyozou isn't playable, I think that really only leaves pre-TS Robin, Franky, and Brook. I wish Bon Clay, Daz Bones, Mr. 3, Arlong, Kuro, Krieg, and Foxy made it in. They're really the only characters missing. I'm also kind of surprised Sengoku isn't playable as he's shown enough to make a moveset by Gigant Battle standards.