Long story short.
After months of being burned by a crummy developer of a certain MMO racing game published by (that publisher everyone loves to hate on). I've decided that its time I finally put my money where my mouth is and just build my own game. I plan on using either UDK or CryEngine 3 as the development platform for PC.
My question is what additional languages should I be learning when working with CryEngine 3?

The plan for this
-full feature performance and visual customization for vehicles including pickup trucks and motorcycles as well as muscle cars, exotic cars and street "tuners"
-open world city modeled after real world location.
-Multiplayer race events including circuit races, point to point races, "takedown" events, wreck your opponent before X time has passed. and others.
-Fully featured chat system
-Auction house for unwanted parts

I know many games make use of some variation of C+ or another.
I just need to know where else outside of the engine I should be looking and what i'll need to learn to start this project.
Mind you the entire point of this is to show a certain developer "This is how it should have been done."

C++

CE3 SDK won't be released until the summer, but its free.

You will need C++, not sure if LUA is still used or not since it was in CE2 for some things.

Yep I'm goign to attempt to start this on ym own until I've at elast learned the basics enough to implement physics on a "vehicle" once I'm past that part then I'll start looking to find people for asset development and so on.

Thanks for the replies btw. At least now I know where to start looking

Being a gmaer for almost 15yrs and seeing so many developers make poor choices with so many excellent IPs, ideas etc. I feel compelled to create something now myself and see if i've got the chops for it