
I wouldn't worry too much about HD compitbilty with a freeview box. Sky plan a 'soft' launch for HD and thats not for some time yet, at least a year. But you won't have even have sky anyway because you'll just have the freeview channels which won't be broadcast in HD for years.
The point is a freeview box is about £50 so if it's not future compitble then I wouldn't worry too much! Be more concerned with buying a HD compitable tv for £££££'s!