I would also like for it get re-released. But the rights would be much tougher to figure out. I'd probably mess around with Mega Man Volnutt and Zero(Though he's partially a Charge character). Worst case is that I go Ryu/Batsu if I want to have an easier time and just go Shoto/90% a Shoto.
Casshan and Tekkaman Blade are for SURE the Tatsunoko characters I'd pick.
C.Viper She's reasonably popular. Partially cause she's been on again and off again good in SF4 from what I remember, and some people just like super-spies. Shr's also a bit of a popular choice in UMVC3. Though I remember that when she first dropped, most people felt like she was way more SNK-Coded than Street Fighter.
And that, unlike SFA/SF2/SF3 I don't think a ton of the SF4 Newcomers are THAT popular other than Viper and Juri. Hakan's got shooters. And Abel's got fans of his gameplay, but a lot of people find him pretty boring. Compare that to SF3, while not initially popular to the Average Joes, SF fans **** with Dudley, Elena, Makoto, Oro, Ibuki, Sean, Alex, Hugo and the twins heavy. And obviously, Alpha characters like Sakura, Dan, Karin and Rose got fans.
I'm curious if they'll dip back into SF5. I feel like Menat and G were popular enough to comeback, more so than Ed.
I'd like Shonen Jump vs Capcom (Or more specifically, Shonen Jump vs Marvel, MADE by Capcom) But given that Arc Sys did Dragon Ball, One Piece and even Fist of the North Star(I'm pretty sure they did the PS2 game) back in the day. They'd probably have a bit of an easier time with attaining certain series and working with Namco.
There's also always Nintendo vs Capcom or Sega vs Capcom if we're talking video game companies. I hope they DO Capcom All Stars, but calling it Capcom vs Capcom would be too goofy and lame for me. I'm sure some ****** would like that, but eh.