Platinum games isn't a Sega group. Sega's just been publishing their recent games because they have a deal with them for a certain number of games. I'll launch nukes if Sega themselves ever got the rights to Devil May Cry.
Yeah supposedly Vanquish is to be the last game in Platinum's line of four game's scheduled in their rather short lived deal with Sega (the other three being Madworld, Infinite Space and Bayonetta).
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I think Kamiya is being very cordial and polite by saying he would do another DMC if Capcom and the fans asked him. Realistically, why would he go all out making a DMC sequel BETTER than his own Bayonetta?