Android OS support?

Is there or will there be support for the Android operating system?

Yes there will be with 3.0. See the press release here at the top of the second column.

Per this forum post in the 3.0/Android/PS3 Announcement thread by HiggyB, Android support is coming at some point in the 3.x Unity product cycle. That is to say, all that's known is it will come out some time before Unity 4.0 is released.