Yeah i know every little bit helps, but i dont think a bigger case is a def no no. Unless focus testing and research would suggest people wont buy beyond a certain size (xbox1/ps3)
Edit after your post: sure the media centre thing, but what other electronics? Br player? Tv setup box? I think thats the only other thing that could be there and from what weve been seeing MS might want to take tv box head on too. (But then still, what other devices are there nowadays?)
The cpu route might be interesting I have to admit. 12 cores? What would be the impact of that? More cores but weaker gpu.
If MS and Sony go heavy CPU this will impact development on pcs, it will set the tone.