7- or 8-inch Surface?

Something in this size range seems inevitable at some point, so I wonder when (if?) MS will pull the trigger? To be honest, I can't wait - as cool as Surface looks, the screen size is a bit smaller than my preference for a productivity machine and a little larger than I like for straight-up tablet usage. I realize that they compromised on the size and that it'll be up a lot of people's alleys, but my personal preferences aside, the market seems to be trending towards smaller tablets, so the longer Redmond waits, the greater the challenge will be to muscle into this new but popular category.

Thoughts? Concerns?