Licensing issues are too big of a hurdle so it's nearly impossible to get a traditional SRW released in English. Original Generation is a different story since it's all Banprestos's. The problem is that the sales for the GBA translated games weren't too good so business sense dictates that Atlus, or any developer who might want release the other OG games in English, be cautious.
As for me, I know some Japanese so I can understand a good part of what is happening.
The new DS game, Mugen no Frontier also has, aside from KOS-MOS, Arisu Reiji and Xiaomu from Namco X Capcom. Those two characters were inspired by two Banpresto OG charas, Kyosuke Nanbu and Excellen Browning.
[shameless plug]For more info on Mugen no Frontier and SRW in general, clicky the forum link in my sig[/shameless plug]
