If it were sporting a quad core mobile processor, I'd be more willing to plunk down that much cash. It'd make it a comparable machine to the 15 MBP in both software capabilities and price.
That's the other thing I'm hoping will be improved with the SB2. If it has a stouter processor, and the tablet portion lasts longer on a charge, I'd be greatly, GREALTY tempted to pick one up. Though I've got to fight through the fact that I don't really need that much laptop, since my desktop does all the heavy lifting, and my light, tablety SP4 has done a great job of meeting my on-the-go type needs.
Man, I hate being tempted by cool stuff.
I feel like I have to be a little more tidy with the 128GB I've got in my SP4, but it hasn't ever become a limiting factor at any point.
Though if you ever feel like it is too little for you, you can upgrade the drive in the Surfaces, since they all use standard M.2 SSDs. The only downside is, well, it's not an easy thing to do. You have to be dedicated and utterly confident in your abilities to be willing to crack one of those things open.