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So the manufacturers with all the driver source code and dedicated teams take much longer than people without the driver source and in their spare time.
I am already running a port of Ice Cream Sandwich on my year old T-mobile G2.
I don't know if you ever used wine for gaming, but I certainly wouldn't call it flawless, or even close. Running non-native games on a phone sounds awful!
Now name popular games for linux not made by ID Software or ported by Loki..