"I want to say a big congratulations to CliffyB (who I am doing some work with) on completing Unreal 2."

Well, I think this means Noogy is working on something different than U2. I mean, it looks weird to congrat someone with completing his work (or with something else) and then noting "I am doing some work with him". In this context, I wouldn't say the project was Unreal 2.

BTW, what about codename Whistler