Since I couldn’t help but test if my Android applications still work, I immediately upgraded according to the instructions: new SDK, version notes, and instructions.
ADT plugin was not upgraded as Eclipse couldn’t find an update.
Outcome:
Applications run without any modification.
Conclusions:
1) I did not use any of the APIs that were changed .
2) Android API is “settling” down. (Or Google finally understood the pain the cause developers each time they change it).