Firstly if you're going to ask a question don't talk like a drunk 14 year old. Use proper grammar and spelling please.
Secondly you never actually left City 17, you just visited it's coastline whilst traveling through Ravenholm, sand traps and nova prospect.
I regularly talk to Garry on the Somethingawful.Com forums and we normally get the GM releases before the public.
He's busy with his new game atm so he doesn't have much time for GM.
Indeed. id and Unreal have never rewritten engines fro scratch except for U1 and q1.
Also Valve has stated in the past that HL3 if and when it goes into development will have a much shorter production schedule because the core engine is already there and anything else they need can just be...