Saw this over at Neogaf:
http://www.neogaf.com/forum/showthread.php?t=437309
Basically Microsoft have registered the domains Microsoft-Sony.com and Sony-Microsoft.com.
This would seem to suggest they are doing something together. Some of the posters are seemingly believing it's a sign that the two are going have a joint console for the 8th Generation, or an agreed standard.
Whilst I can't see that happening, I do see the logic behind the thinking.
Others think it's something to with phones/tvs etc What do DP think?