@AaronBertrand
When you run the cu3 exe hotfix/update file, the first screen after extraction of files is processed (the configuration check screen): on top it says "Sql Server 2012 Update ... This installation provides updates for SQL Server 2012 CTP Preview (August CTP)." All the updates for Sql2012 say that, but it could be I'm the only guy who reads these screens.
Local db is always showing at 11.0.2100.60 for me, both in "remove programs" (control panel) and in VS2012 Sql explorer. It looks like a bug (along with the old multiple Data Tier App framework that get littered there).
I didn't realize LocalDB got installed with Sql2012. I had installed VS2012 pro (after sql2012), and thought localdb was installed with VS. I only use or see localdb with VS2012 (where you pretty much have no choice but to use it)--View, Sql Object Explorer. Seems VS2012 also requires it with database schema compares, which I do all the time.