Thanks to LuigiBlood for showing me how to use CrystalTile, I was able to start ripping from the overlay files in EXE:OSS. The overlays are a mess. They're cluttered and unorganized - like the rest of the game. I was still able to get some screenshots and ripped some of the new artwork that Capcom never formally released.
The rips are on Sprites INC. If I have some spare time, I will be able to rip more screens. You know, the stuff that's actually new. The animation on the right is the updated 256x192 Jack-In animation. Unfortunately, it still suffers the problems of compressed graphics in 2000-era Game Boy Advance games: they're really low quality.