And good news for developer is that Ice Cream Sandwich source will soon be releasing to Android open source project. Thanks to Google+ post penned by Jean-Baptiste Queru, the Technical Lead of the Android Open Source Project, and his link to an email written by Google engineer Dan Morrill, we do indeed have confirmation that Android 4.0
source code will soon be releasing.
Also, till now developers were not encouraged to use undocumented Calendar and Text-To-Speech (TTS) API’s as they were subject to change in next version of Android. But good news for developer is that, this undocumented Calendar and Text-To-Speech (TTS) API will be documented publicly in Android 4.0 :-).