For now, we still cannot have a source code to look into character slot limits, as well as i've mentioned before about mod compatible:
I: IGB
1. We still cannot mesh modding & can't use pre-Remastered Edition IGB files
2. The rest can still be modded, but some are different:
A. Current PC model IGB offset is albeit different than original PC IGB offset, but still the same DXT1
B. Hud & Power Icon offsets are DXT3, which involves Alpha Channel editing to make the background transparent
C. On existing retexture mods, which were retextured from original PC IGB above to transfer to the current PC IGB, requires a time to find the current PC IGB offset
D. For py script & xmlbcui related formats (like engb, xmlb, pkgb/pkg, itab), since some files has an achievement/trophy codes requires a time too to edit carefully
II: Sound format seems very easy, since there some programs to extract from pak & fsb, which contains mp3 format files
Anyway, Teancum, have you already told the developers if the PSP exclusives (characters+simulations (including simulation of the former PSP's Hawkeye)) will be available in the later patch? They're the last existing Ravens' certain console exclusives since they have an unused HQ materials on Wii found by one of us modders, & there still remaining issues & some missing files left that needs to be fix/updated, as well as there's always been an UI changes (which affects character select, such as a difference on Iron Man's position between this current RE & PS3/360/PC)
These are remaining issues & missing files as i gathered an info from some users (Steam or not) & found, which needs to be included on later patches, other than the missing PSP exclusives:
=MUA1 Only=
* Missing PSP exclusives, they're the last Ravens' missing console exclusive:
** Characters: Black Widow, Captain Marvel, & Ronin
** Simulations: For these characters (including for the former PSP exclusive character turned 360 DLC/Gold Edition DLC, Hawkeye) + Survivals
** NOTE: HQ materials (models, stages, huds and power icons) are found unused on Wii version. Since there's always UI changes since Soul Calibur II HD's features (like having the former PS2's Heihachi and the former original Xbox's Spawn) as an example, there still more empty slot left for these 3 characters besides both either Moon Knight or Spider-Woman
* Some sound files are still missing, such as Storm and Mr. Fantastic's other sound files. But, are Storm and Mr. Fantastic always missing some sound files in all pre-Remastered Edition console port launches from beginning? Like: Commands, Jump, Land, Pain, Death, Throw, Lift, No Power (for Mr. Fantastic only missing this sound), Too Heavy, Level Up, .etc
* There's also some other sounds, which plays wrong or inverted, in 5.1 surround sound channel. Some player reported
* There's Recorrect Blade's Daywalker Hud, and Wolverine's Modern Jacket Loadscreen from Wii version instead of the buzzy PSP one
** Footage showing Jacket Wolverine Loadscreen found on Dolphin Emulator gameplay, which means an HQ Blade's correct Daywalker hud also included there, as well as PSP exclusives:
https://www.youtube.com/watch?v=9nMVFMKpFnQ* Reported from the user who owned PS4 and play as Colossus, that the user hears Colossus missing his jump and pain sound
* Some characters' hud backgrounds like on Bruce Banner's hud are not transparent alpha channel:
http://images.akamai.steamusercontent.com/ugc/264972387352710616/6BFFB7205F3A55CFFD020297343E9FF410966E3A/=PC version for both MUA games=
* Remaining Game Issues for not starting on Windows 7 & 8/8.1 on some player's computer
* Remaining Controller Issues
** Xbox One unpredictable issues as what happened to some user who played on Windows 10, & Windows 8 with that controller
**Steam Link issue:
http://steamcommunity.com/app/433300/discussions/0/350540974003073758/**Remap 3rd-party controllers (like Logitech) still incorrectly, involving a D-Pad & Right Analog still not working. Report from some user including myself who tries the current patch
**Missing Custom Configuration (as found on MUA2, but recently cannot be edit & useless to both games)