Mega Man X4 was the first of the series to ditch the SNES and take full advantage of the 32-bit Sega Saturn and PlayStation. Apart from PC versions from around the turn of the millennium and a mobile phone port in Japan, Capcom hasn't put out either game as a standalone on other systems until now (they did appear in the PS2 and GameCube Mega Man X Collection). Does this mean Mega Man X6-8 could be on the way too?
What we do know is Mega Man X3 is coming to the Wii U eShop tomorrow, since it's the last one left in Capcom's Roll-out of weekly Mega Mans (Mega Men?) this month. If you're eager for some X, the series' first two entries are already available on the eShop.
Sony PlayStation 3 (late 2012)
Sega Saturn Console