As the recent Street Fighter V beta is also open to the PC there has been some serious data mining going on. Now we do know how many polygons and bones some of the character models are made of.

So, for everyone who is interested:
Rashid:
77.900 polygons and 383 bones
Nash:
114.300 polygons and 397 bones:
The data also leaked some upcoming characters. Among them
Urien:
82.400 polygons and 332 bones.
(this is not an official render!)
As a comparison, Ryu of Street Fighter VI featured about 16.000 polygons (which is suprisingly low):
So the new character models have about 6 times the polygon count. Wow, that's an improvement... Their finger tips are still pretty angular though. ;D