I'd say that depends on the effects you are using.
I really hope that UVD will be used, because I don't want to decode HD video on a little APU without assistance of a suitable ASIC that is already built in anyway.
Good to see SI comes along. I never expected a quick working since when you compare the driver set for the former chips, how long it took and now a new HW generation... meanwhile I stick to my HD 5xxx. It's already fairly well supported.
Stop TCPA, stupid software patents and corrupt politicians!