Recently, even the most died in the wool 40k player can't fail to have noticed the ructions regarding WFB. The End Times seems to have been a huge success - some dual players have asked if a similar thing with the failure of the Golden Throne, be repeated for 40K. There was apprently in one of the fluff pieces, descriptions of a massively powerful warrior in silver armour that I have heard several persons ascribe to be Draigo (or whichever GK it is who cruises around the eye of Terror Hood, pimp-slapping people for ever and a day).
But a couple of bits from the latest rumours are interesting:
1. Potential races 'disappearing into space' as the Warhammer world breaks up - lizardmen to 40K Slann?
2. Round bases?
So, what are the chances of cross over?
(Retro fact - the old Warhammer Siege book, written with entries for both 40K and WFB, was the last official publication to be cross compatible, with a specific points lay down of 40K-WFB at a rate of 1.25 ie 1k of 40K could fight 1250WFB.)