Before we get all depressed just remember a few things:
Technically Windows mobile phones are not supposed to be unlocked and reflashed with a custom ROM.
Technically Sprint TP2 devices are not supposed to have WMO 6.5 yet.
Tehcnically we are not suppose to be able to tether without a tether plan.
... and we all know how well these limitations held up.
So I'd take things with a grain of salt until the OS is actually released and the geniuses at XDA/PPCgeeks have some time with it.