That all depends on whether or not someone will be able to break the chain of trust and allow the unit to be hacked the same way the old DirecTivos could. This is definitely not the forum for this type of discussion, but I'll bet it will become a hot topic over at DDB. We were able to get MRV working using a SA Tivo image with the older S2 DTivos. IIRC, the HR10-250 HDTivo had the MRV code embedded in the OS so all that was necessary was to enable it.
The only way MRV would work with the new THR22 is if it already has the code embedded or if a standalone image from an S3, Tivo HD, Premiere, or Elite is compatible with it. I'm not sure if the Premiere has been hacked yet and probably not the Elite either. Chances of the THR22 being hacked anytime soon after its release I'd estimate to be slim to none.
The only way MRV would work with the new THR22 is if it already has the code embedded or if a standalone image from an S3, Tivo HD, Premiere, or Elite is compatible with it. I'm not sure if the Premiere has been hacked yet and probably not the Elite either. Chances of the THR22 being hacked anytime soon after its release I'd estimate to be slim to none.