RWE recently announced the release of their brand new software for Sept. 1rst 2016 (see press release here in german).
IMPORTANT for all openHAB users: Do not upgrade immediately as the new RWE Software (which will update the bridge) will be incompatible with the current RWE SmartHome binding. A successor for openHAB 2 is currently in development and will support the new and official client API, but it will take me another approx. 6-8 weeks until I can release a first running version of it.
I have an early beta of the binding out and running for some months. You can download it here. It still has some glitches I am currently working on and hope to be able to get out a new version next weekend or next week.
However, the new innogy binding is only for OH 2 and must use the innogy web service (this is how the new official innogy API works). Thus it cannot access the controller directly any more and needs a running internet access to work. This adds some error sources like your internet access and the availability of the innogy cloud to the equation and makes everything a bit more complicated to implement.
But I hope to be able to fix the most important bugs soon to get closer to a stable release.