I'm not sure I'd use a pi has an HTPC for true blue-ray type 4K. Not to ding it, and I'm very excited (and happy to be proven wrong), but I'm not sure it will have the performance for that. I expect quite a bit will depend on whether or not someone puts in the software optimization work, as I remember how powerful PCs couldn't decode what they can on today's codecs a few years back. But we'll see.

I guess maybe if you added a heatsink and/or fan? I'd be a bit concerned about component life, taxing it that hard.

Oh yeah, and I wanna see how this thing overclocks.