Unfortunately, D developer room was rejected:
Like every year, we received quite a lot more proposals than we
have
rooms at our disposal. Unfortunately, we were not able to
schedule your
proposed room this year.
The list of accepted rooms can be found on our website. We hope
you'll
agree that we have an interesting lineup despite the absence of
the room
you proposed. If the content you intended to schedule in a
dedicated
developer room fits in one of the accepted rooms, please submit
it there
when the CFP is announced.
List of accepted developer rooms:
https://fosdem.org/2015/news/2014-09-30-accepted-devrooms/
Don't know if something related to D may fit one of accepted
devrooms.