Nasa Moon Buggy

If NASA return to the moon, they need some kind of Lunar Rover as the last. But did they ever give the company the contract to design and build?

The short answer is no. The contractor has not yet been selected for future rovers. The Constellation program is still working on launchers. A large part of the requirements for lunar exploration are "determined".

yer Lamborghini

No, they come to Yahoo! sorry for the joke.

Yes, as part of package to return to the moon, many companies are either already working on the final design or the process for obtaining the final design done. You may want to search for press releases from NASA for the name of the company.