A: No. Android Studio and the Android plugin for IntelliJ IDEA are built from the same code, and all of the changes in Android Studio are, and will continue to be, available in IntelliJ IDEA releases.
It's a fork in the sense that it's a fork of the IntelliJ repo with Google/Android related assets added. So it's more of a branding fork than a code fork, but since its in a different repo I'd still call it a fork. But it's just terminology I guess.
