Now, I was under the impression that Blizzard eventually wanted to combine the dual specs and equipment manager features -- they were taking their sweet time making sure it was exactly right, but eventually when you switched specs, you'd be able to switch into the gear you wanted at the same time. But apparently that's not the case: the lovely Nethaera over on the forums says that no, there are no plans to connect the two. They believe that many people will want to change specs and gear at different times, so you'll still have to press two buttons if you just have two gear sets for two specs.
Fortunately, that functionality is filled in very well with addons, and Eliah did a nice writeup last month of how to do it with a few of the available addons out there. Which is probably why Blizzard isn't doing it -- we've heard at the BlizzCon UI panel that they're more than happy to let addon authors fill in the extra functionality that they believe only a few players are looking for. And as you can see in the thread, there are macros that will tie them together as well.
Better for Blizzard to get to work on something else than put together functionality that those who really need can already find. But yes, if you're waiting for an official solution to switching gear and specs at the same time, look elsewhere.