Hi Jones,
Well it looks like this USB DVB-T tuner has been supported since the 7.04 Kernel so as far as I can see it is basically going to work. However it will not be 'plug n play' inside LinuxMCE in the sense that it will not automatically get configured and added to MythTV as a 'capture' card. You have two options to solve this - use MythTV-setup to add and configure the card like you would if Myth was not part of LinuxMCE or read up on how to create a LinuxMCE device template for a tuner card and create one for this card
(Thom will love you forever if you go the latter route :-)... as getting device templates added by everyone who has a new tuner is a great way to 'grow' the number of supported tuners)
All the best
Andrew