NVIDIA is currently in beta with the GRID K1 and K2 cards reworked as K1A and K2A which come with Active cooling. Mostly probable, NVIDIA will offer more power to the existing GRID cards and not just the active cooling, making them fit in lots and lots of hardware, not just the ones specifically designed with top performance airflow.
The rumors say that the new cards K1A and K2A will be available for order in Q1 2014, latest Q2 if some plans go wrong.

Cheers!