Something I want to see from a Win slate is a move away from the computer-as-parasite model that Apple’s pushing. I love my Macs (and run four different OSes on pretty much a daily basis on my various machines—I’m no zealot.) But, I hate the closed-box model of the iPad and iPhone. A full-up filesystem-based commercial OS on popular, competitive slate would be a good thing for everyone.
I'll agree, but I'll bet it doesn't happen. The general purpose computer is already relegated to engineering development and computer techs. The average person, home or office worker, just wants a stable application platform, and they couldn't care less, really, whether it's Windows, OS-X, Linux, or LCF (laminated chicken fat).
An open system is a great thing, but I would guess most potential slate customers don't understand what one is, and most of the rest don't much care.
Techies do, of course, and debate the pros/cons constantly. But we're the vast minority of users.
So we'll see. Like I said, I'd like to see it too. I'm just not holding my breath.