Yes, it looks like it's true... We got Mega Man X5 in February, and Capcom is already working on X6!? You can see the line-up of Capcom games for this year E3 here. Mega Man X6 is listed under the Playstation games (yes, it's on the PSX!). There's no official word from Capcom yet about this. I wrote to them so they can confirm / deny this rumor. I'll tell you as soon as I get the answer.