As much as my in-depth researches go, we won't see many more Android phones comming this or next year. We will see the current Android-model with a qwerty-keyboard like the palm-pre at the end of 2009 or beginning of 2010 (unfortunately it will use the same hardware and camera).
New android phones will arrive at the end of 2011/beginning of 2012.
I will try to update on this as soon as I get more information.
There are not many Android phones right now, but there will be more phones eventually, and so there will be more applications as well.
Personally, I expect this OS to be very successful especially when the manufacturers use it on many phones of different kinds.
I guess because android-OS is still somehow in BETA and a very unpolished OS. In my humble opinion all software-developer should concentrate their effort to make more and better iphone applications.