I got the notification in Developer Console. It supports Multi-APKs. You can have each apk to each:
- version of Android
- Screen Size
- CPU architecture

That is very helpful. I was considering to build a new version for Android 4.0 and put it into a new apps, e.g. AdvGenToDoV4. Now, I can put it into the original app. That is the better way to organize.

Reference:
Multiple APK Support - Android Developer Guide