Hi,
yes, correct, the polygon limit was removed also in the Alpha 3.1 version, but be careful that you need more than 16GB of RAM to go over 10M triangles without going to paging mode. About VRAM, you can reduce the Parallel Samples value to 1 in order to save space for geometry... roughly, 1M triangles take up to 170 MB of VRAM.
Here is a simple scene that almost grows by 1M for every rows of the upper mograph cloner:
ciao beppe