I admit that it would be pretty uncommon to spread epilogues out over multiple episodes/DLC, but it has been done before (I can think of 1 game but they charged money for the final epilogue dlc). Considering how many endings there could be however it could be expected to spread them over at least 2-3 epilogues/packs. What I currently think of:
- At least a DIK and CHICK ending per MG with probably a third independent ending based on TC. My guess is that NEUTRAL route's endings can be either the normal DIK or CHICK ending but maybe based on how many post-ep8 (or even total overall) major choices you made combined with your status
- 1-2 endings per SG that have a "confirmed" route
- Endings based on how often you had sex and with whom without ending in one of the above routes.
- Maybe 5 Zoey endings: 1 per switch from MG and 1 from others
- Maybe two "secret" fun endings: An extreme dark ending where MC comes a die-hard criminal like Vinny if you choose every DIK option (both major and minor), or an extreme positive ending where MC acts like an angel if you choose every CHICK option.
It's still possible that besides the already "confirmed" Bianca route and probable Cindy route, there will be more new last-minute routes added in episode 12 (Sally, Mel and Sarah come to mind, with if Sarah happens it will almost certainly be an open relationship)
Like Darkwen said, it could easily go to 50 and possibly even more.