A rumor has been going around that GM is interested in buying Proton, which is the Malaysian car company that currently owns Lotus. Not sure what it would mean for Tesla Motors if GM ended up owning their partner. (Incidentally, GM has owned Lotus before, during which time they developed the LT5 DOHC V8 engine for the Corvette ZR-1.) It would not seem that GM are interested in Lotus as such, they just want Proton's factories. So even if they bought Proton they might end up selling Lotus or spinning it off.