CSC announced they have an RX3S (380cc twin) and an RX4 (450cc single) for CARB and EPA certification, and general evaluation.
A spec chart from the blog. Some of the figures are known to be wrong (dimensions are nuts) but there's lots of interesting data here:
Source:
http://californiascooterco.com/blog/
The RX3S is interesting; I'm still trying to work out where the RX4 fits as it's more power and torque but only a bit, but significantly heavier. I own a TT250 and it's oustanding value for money. Well made and easy to work on.