So I've had a few updates to TR2012 from Steam(besides RW2 to TR2012 update) and for the life of me I can't find any patch notes. Been wondering it they fixed the multicore CPU issue or not. All that game needs to run great for me is to run as 64-bit.

Patch notes are usually posted on the wall at there Facebook page.
You don't need a Facebook account to go there fortunately.
http://www.facebook.com/railsimulator?ref=ts