I think the DTP has become his main outlet for his typical Pop/Metal kind of stuff, and any other experimental projects like Casualties will be done under a different project/name. For Dave, RVP, Mike, and Beav, the DTP is their main job so it has to be Dev's main focus as well. That's why he didn't take that hiatus he was talking about last year, because he's got 4 other guys in the band plus a live crew to pay.
I'm sure Transcendence will be my AOTY, but I do wish he'd do something different soon, like another Casualties record or maybe resurrect Ghost 2.
He's mentioned several other projects over the years like Obviouser, an Electronic album and of course the Symphony(Moth) which he says will be his main focus after Transcendence.