Looks like the 500S aka 520 is available in the US now. The new 500 engine in the 400 frame. A single seater with EPS should be what some guys are looking for.

I love mine

Purchased mine in March.  Right now it is back to the dealer because of a problem.  Seems that I should have checked the engine oil when I got it, but assumed it was good. After riding for about 136 miles I decided to check oil level (with my previous machine I checked it before each ride) No oil on the dip stick so added a quart and oil was just visible. No oil on garage floor, and no black smoke when riding.  Called dealer and they came and got it.  Seems that the factory ships the machine with oil in the engine.  Not sure what the problem is or if engine harmed.  The dealer is booked solid and they can't get to it until around the middle of May so will have to wait and see.
However with the limited riding I was doing I really liked the machine.  Sold my 2014 570 RZR and bought the 500s.

Might be fine, but the dealer should have checked it before it left with you. If it was right, than it went somewhere. Let us know how it works out.