JJ2+ is quite a diffirent story. As far as I understand, the topic is about a full remake, new Jazz game with gameplay heavily based on Jazz 2, but on a completely new, rewritten engine. If such, it's a great opportunity to throw all the technical limitations. I imagine something more visually similar to Braid or Rayman Origins.
Stijin, I fully agree with you, and I doubt that this project would even start on, seeing Razz Arena, Project Carrot or even JJ3D patch progress. It's hard to take DennisKainz "plans" serious, he doesn't even have basic programming knowledge, even how to use gl_quads to render 2D graphics.
Don't look at me; I'm a horrible programmer