When are they coming ? 
There could already be some wide discussions about Android dev right here. For example, I found this class description :
The first example shows how ridiculously simple it is to create a 2D movieClip.
Actually it is so simple that it could be a great way to plug an Android SDK based UI in any Unity game.
I love their dev docs 
edit : haha I like their sense of humour xD
Oh and by browsing the ref docs, I also found a “possible” answer to an old question roaming on these forums :
I imagine they’ll be coming when Unity Android is done, or thereabouts.
Nope, because they are talking about Java (not used by Unity) and it depends on the implementation. For example, in Unity 2.6.1, using JS, foreach (for/in) is faster than the normal for loop. Later they talk about not using enums because an int is faster, but in Unity, ints and enums are the same speed, and probably the same thing. So basically you can’t get any useful info from that page regarding Unity.
–Eric
Oh, I thought the basic logical components (if, for, while, etc) in Java were all derived from C++.
Well then …
Being derived does not mean being implemented the same way. They´re the same just because they both are implementations of Boolean Algebra, but the way the compiler generates the machine code for them may be different.