I remember what google initially was - The Anti-corporation. Its whole thought process in the beginning was that it was different from the other conglomerates. However, as time progressed and they became immensely wealthy, they have strayed from their own philosophy in my opinion. Between that and their potential information hoarding, I have a while back switched to a combo of bing + yahoo and pretty much said fuck google. However, ANY company that will close up shop on a $1 billion a year branch just to say screw a government, is ok in my book, and will have proven they are not merely the corporate machine they once hated, and still have a little bit of what made them what they are hanging around. That said, should they close up shop in China, I'll switch searching back to google, and will likely shit-can my iPhone in favor of a droid one on general principle. This is how strongly I'd agree with them moving out due to the unfair and facist government of China.
End personal thought, I dont believe for a goddamn minute they are serious and agree with Mr. godhatesusall that its likely a PR move.