Any reliable sources for that information?
So far the UL community hasn't seen any of it.

That's all I've heard recently from the UL community up here...they're all saying in 2007 the FAA will be clamping down on fat ultralights.

I don't have anything solid though, it's all hearsay. I've read a few things in various places online about considerations for brakes, starters etc. (such as Ultraflight Radio) but as far as I know it's all being worked out still. I'm not sure where the "2007" stuff is, but that's the year everyone is quoting. I almost bought a Challenger, and I was told by the owner that I would have no problem flying it until 2007, when I'd have to register it as an experimental. (There was NO WAY that thing would ever weigh under 254 lbs.) Most of the guys up here are old, and I don't think many of them have computers, let alone internet access, so most of the info is word of mouth.