https://www.mediawiki.org/wiki/MediaWiki_Developer_Summit_2015#Schedule features a Mobile room (Robertson 3, with a capacity for 50 people in classroom setup).
This room was proposed by @Qgil and @Rfarrand when @damons requested top priority for mobile related topics. In further discussions with @RobLa-WMF though, he argues that a dedicated mobile room might be a way to actually isolate mobile from the rest, rather than promoting the emphasis in mobile across the agenda.
The MWDS is approaching fast, and we need a plan. The organizers of the event are pushing for "togetherness" as a driver of the event as a way to encourage discussions across teams and topics, but solving the questions of the Mobile room requires the initiative of (ideally) the mobile teams, the Architecture Committee and WMF Engineering management. @Tfinc is the ultimate owner of the mobile topic.