You can right now buy MacBook Pro 15" with 1680x1050 display or MBP 17" with 1920x1080 display. The pixel size on those displays is pretty darn tiny; I doubt higher pixel density makes sense on laptop due to further viewing distance (compared to iPhone).

About new products: I would love to see 15" version of MacBook Air, or slimmed down MacBook 15" without optical drive, brand it whatever. Dear Steve, get rid of optical drives, please.

They will not; OS X is not fully resolution independent yet.