According to latests interviews of Paul Sage & announcements, we are unlikely to see any update to the game before the 4th quarter/end of the year and the current idea of ZOS is to release updates to PC & consoles at the same time.
But why?
It's no secret that PC players have beta tested the game for consoles, we're gonna beta test Champion System before console launch and many of the game breaking bugs have been fixed (except those that obviously have no fix like Cyrodil) while we endured them.
So my question is, why not continue? No matter what happens and unless you change the way you test your releases, we will always have bugs. Might as well release on PCs when content is ready (such as the Imperial City and new Solo zone you where supposed to release in updates 6 and 7 and that should be ready), that way we can test it on PC, report the bugs and you can, once again, deliver decent content to console players thus earning more money.
It's a win win for everybody and it would also keep PC players from unsubbing after 1.6 is live and then waiting for a new DLC to be released which translates to even more money for you ZOS!!!