The last time I looked into it, there wasn't any sort of upgrade path.
I think the newest Jasper units have actually addressed the issues (fingers crossed), though I haven't done a ton of in-depth reading. I don't think the Elites have the Jasper chipset yet (again, this is just my impression, not having really researched), though there are rumors of a new bundle to include Halo 3 and Fable II which I imagine will have it. I guess the way to know whether you're buying one with Jasper is to look at the power spec, which should be 12v.
