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.