This may be absolutely nothing, but Warhammer World have just posted up their events calendar for the year ahead and a couple of things in July took my eye.
Warhammer World Events Calendar
Most rumours point to 6th Edition coming at some point in July, and on Saturday the 14th July there is a new art exhibition commencing, along with a Design Studio Open Day and an event the following day called 40K Cataclysm.
Purely speculation on my part but if 6th was coming in July, that would be the most likely date.
Unless Cataclysm is a club event that I hadn't heard about?