I am sad to say I gave up hoping.
I now have a Samsung Galaxy S and have never looked back.
I wouldn't have changed phone if I had of known an update was forthcoming but I still sincerely doubt it ever will.
There is a September update but I am guessing it will be for 2.1 android phone users only. I hope I am wrong as I would still like my Tattoo to be all it can be.
Sony Xperia S (TuRdZzROM v1.3.0 - 6.1.A.2.55 ROM)