I believe the MBP motherboards are on Rev B now and the MB motherboards are on Rev F now. I have not heard a service technician post to confirm this, but that is what I heard from a direct source.
As for swappable HD, that would necessitate a case design change at which time your magnetic latch would be likely.
However assuming no case change, a motherboard update is essentially guaranteed, a soldered Merom C2D is the whole point of the discussion, a graphics upgrade is on the top of everyone's list, and perhaps we will see the airport slot and internal antennas (note plural) support 802.11n cards in the future from Intel and Apple and also suppport simultaneous a/b/g/n (2 at a time). Typically a/g or b/n.
I posted a long time ago and I reiterate, where's my "Air Power - tm" wireless power capability? Huh, Apple? Get off the dime! The microwaves might not kill the cat and the baby!
Rocketman