Whilst a Media Server sounds great to the more technically minded, I think the success of Sky+ and the V+ is down to it being so easy to use. The rest of my family never mastered setting the VCR or even changing TV inputs for DVD playback, but they use the V+ with little difficulty.
Whilst I'd be surprised if the new Samsung doesn't support MPeg4 (it wouldn't have much of a market outside the UK if it didn't), I would expect a whole plethora of additional functionality over the existing V+. "Late Summer" is what they're discussing at VM, pending successful testing. More
here.