Android software updates remind us of the NBA draft lottery system. You think a handful of teams have a good shot at winning the 1st round draft pick, but the results often surprise you.
When you hear that devices being upgraded from Android 2.x to Android 4.0.x are receiving a 66% performance boost and longer battery life, you get excited. "Wow, my phone might last an extra hour!"
Android 4.0 offers longer battery life.
But then you realize you don't own the HTC Vivid, and your device will have to wait.