If you're on the UE forums, then you've seen this - check MM's response in the thread - reply #5 I believe -
http://www.unlimitedengineering.com/...407#post232407
MM almost makes it sounds like he's not finished with the RC scene, but I don't know what to think. I have enough spares for my 3 that I will continue to run, build and modify until I run short on spares. It would be nice to see him make a comeback, especially on parts that wear (Super6, cvds etc). But I wouldn't blame him if he remained a custom motorcycle parts inventor/supplier.
Also, the guy who posts as "bnighs" on UE forum (I've bought a lot of UE stuff from him, he is dependable and reliable - check UE BST trader info also) posted a few weeks back that he had finally "finished" the UltraMaxx E-Maxx gear sets and they were available. I believe he explained he was involved in getting them produced (latest generation) and IIRC said he had 30sets.
Ben works a weird schedule, so if you try and contact him, it may be a while before he gets replies. I think his job is in a diff state from where he lives and he is gone days at a time. He has always replied to pms I've sent him. I've seen no further mention so I have no clue if he still has any left - most of his dealings go on via pms.
Ben is the guy who made the OTB trans setups that were used for supermaxx.