Personally I put all my development efforts on hold (the queue of open issues for MQTT is growing unfortunately, sigh). But it was expected that after OH 2.5M1 release and the reintegration process with a build system change at the same + bundle renames that the IDE setup would break.
You should watch The Road Ahead - Reintegrating ESH where Kai periodically posts progress information.
See also here: https://github.com/openhab/openhab-core/issues/513#issuecomment-462764668
Cheers, David