I would, admittedly, like to see what the next installment will sound like, but I'm like that with his solo work too. While he's working with solo stuff, then I am very much appeased, but the moment I see anything regarding new PT appear, I'll hit the preorder button so hard that my keyboard will smash (and yes, I'll have had a special key made with "preorder" written on it).
Either way: I don't mind which project he concentrates on, and I'm damn excited for the third solo.