I don't let anything freeze after repotting. Or I try not to. I wouldn't want to over water a newly potted tree. Maybe I shouldn't refer to it as dry but a newly potted tree soaked before a freeze seems risky. Most of the winter everything I have is frozen solid. I'm not sure of the OP's wintering situation, but if it's insufficient to keep above freezing any new root growth could be compromised by disease and/or frost damage, correct? Not arguing, just referring to this particular circumstance. Trying to stress the importance of maintaining an above freezing environment for a tree repotted outside of an ideal time.
Personally? Hehehee....I just get in there, cut out what ain't pretty, get as much of the old nursery crap out as I can, soil up, water in and let the chips fall where they may....