From my understanding the Toxik team and Combustion team are the same. With that information I don’t expect anything with Combustion at this time, given what they are working on with Toxik 2009. Toxik 2009 has been announced, but hasn’t shipped yet meaning that it is probably still under some point of development/testing. This would be a horrible time to pull resources to do anything for Combustion, IMHO.
I tried to put my input in to those that I could get a hold of at Siggraph, with saying that if they are to continue with Combustion it should really be focused towards Motion Graphics. Otherwise they are trying to develop 2 products with one team that do the same thing. At this time Toxik lacks any kind of motion graphics tools so I see this as a good area for Autodesk to fill a void with Combustion. Where as Toxik has many benefits over Combustion when it comes to compositing effects and digital assets.
If you are looking for desktop compositing Toxik, Nuke, and Fusion are really the future.
-Eric