Is Adobe going to make the Mercury Playback Engine compatible with the NVIDIA Quadro K2000M?

It already is, but the memory bandwidth is abysmal, it is terribly slow and you may be better off not using hardware acceleration with that card.

It's performance is comparable to a GT 640 desktop card, see Video card performance and scroll down a bit. Of course on a laptop, this performance will mostly not be reached, because of the slower FSB.

The next release of Premiere Pro previewed at NAB adds supports for this card