Android 2.2 (Froyo) is coming soon; some leaked versions have already been spotted. It is supposed to bring a host of new features with it. It is one of the major releases after 1.6 and 2.1. Here is the Unofficial Android 2.2 Changelog.
Android 2.2 New Features:
JIT Compiler
The JIT (Just in Time) compiler can dynamically compile [...]