Right now we have a separate FennecStumbler Eclipse project. The stumbler requires no resources, so it doesn't need a separate project. We can make our lives a little simpler by folding the stumbler sources into the main Fennec Eclipse project (like the search sources). When we enable MozStumbler, that'll make Eclipse users' lives easier.
The Android Eclipse IDE integration has been totally superceded by the Android Gradle and IntelliJ integration from Bug 1041395 and friends. Bug 1196367 is removing the Eclipse support entirely.