My laptop right now can barely play SC2 ( currently starts a game out at 12fps and quickly goes down to 6-7 as more units get put into play ). I'm looking to purchase a new laptop, one I've already determined should be capable of playing the game on high-ultra settings. But my question is this: will Heart of the Swarm and Legacy of the Void have similar, if not the same, system requirements? I'd hate to spend so much money on a new computer and then have it not play the final expansion very well.
Hmm, I seem to have misplaced my time machine... Anyway, logically speaking, the requirements should be around the same. They're expansions and not full games so Blizzard is going to want people to be able to play them on the same computers they're currently playing SC2: WoL on. However, that's still in the future and there are no guarantees it will work on hardware you buy now. That said, I think if you buy something above the recommended specifications (note recommended not minimum), chances are pretty good that the expansions will work on it.
If we're talking about a year or two years from now, you may have decided to buy a new laptop by then anyway.
It's most likely the same. Imagine them as expansions. Expansions don't have fully upgraded graphics.
^ Be more concerned about Blizzard increasing the unit cap in the expansions, and implementing a quicker build, so you can realistically meet that unit cap. More units means higher model count and more pathfinding. These are the two biggest guzzlers of gpu/cpu power. edit: the map size is also a problem. If they decide to increase the maximum map size in the expansions, the game will demand more cpu power more memory.