Also, how much are they charging for the upgrade if I own my 622? Or should I wait for a newer HD DVR that's coming soon?
Really no need unless you want a black receiver and a bigger hard drive, that's really the only main differences between the 622 and 722. Or you can wait for the 722k, which has the two-way remote capability, but I'm guessing that might be added to the 622/722 with a software update in the near future anyway.