I guess someone got to Sad Panda. Hastings posts in the comments on Atia's blog.
In the last couple of months GW has been pretty good at doing previews reasonably ahead of time. The next release (steamhead presumably) has been the exception. It is possible, as someone said, that they don't want to divert attention from gathering storm 3 which is a very big release for them.
At the latest we will see retailer info next Monday, but I will be very surprised if we don't see something official before then.
Regarding the rumour engine pic, it is almost certainly a board tile, probably from the game they are planning to show off at Adepticon.
Gw's recent boardgames have been great and have really revitalised my interest in the hobby. Just 2 weeks until the big reveal. I hope they steam it.