Ok, I don't see anyone else from the team replying so:
it's up to Kaiser wether he wants to donate the art to DP, you can implement the code in DP IMO. I have nothing against it.
The thing with Imperium is - most of the leveldesign is done. But as long as that weapon isn't done, adding gameplay is hard to do. Gameplay is pretty inconsistent anyway, since some of the gameplay was already implemented before we switched to DP, while the newest additions make a lot of use of DP-features.. So we need to fix that.
My level (level 5) is actually done (save for some scripted sequences), I've uploaded it a while ago, but no-one has commented on it yet.
The one I'm creating with Maarten (level 6) is almost done, but right now Maartens pc can only run classic duke, so that slows the process down obviously.
Hope that explains enough.