Gingerbread newest version for Samsung GS 2

Hi, I am currently running V.2.3.4 on my Samsung GS 2. The phone is unlocked purchased on Internet and I am with AT&T in US.
My question is how can I get 2.3.5 or higher if it's official released by Google says for UK but not for US. I don't even know Google did release it in US or not.
If not, can I still do it and where can I get it?
Any reponses would be appreciated.