Searching the web and the Android Team announcement I couldn\'t find The answer. Will Eclipse ADT be deprecated when Android studio reach its first stable version? The funni
Intellij had support for Android Development even when every how-to was assuming use of the Eclipse ADT.
It appears to me that pretty much nothing had to change on Google's end to make this happen except to make the export functionality in Eclipse more digestible and you get that in the latest SDK Manager. I'm not an Eclipse user, but this leads me to believe that support for Eclipse would require work to remove, so I doubt it's going away. (E/A Much Later: It apparently required work to support and so it did go away)
Android Studio is essentially a stripped down to the Android Specific stuff of of what will be released as the Intellij IDEA 13 Commmunity Version (which is also free).
If you find you like Android Studio, and want to do more Java development with something like it, look at the IDEA 13 EAP. In December (the targeted release date), you can either pay for the ultimate version or use the free community version, whichever suits your needs.