This was sketched in outline in the massive Shaman Q&A post that went live a while back, but now we have details on how they plan on redoing the Shaman totem interface for patch 3.2. Remember these are just plans, and things may change as the development of the patch progresses, but this is the current state of things.
Shamans will get a new bar for their totems, above the main action bar, where other class-specific bars go, like Paladin auras or Druid shapeshift forms. You'll have a button for a totem of each element of your choice, a button for Totemic Call (renamed Call of Earth), and a button for a new ability, Call of Fire, that drops all four selected totems at once, in a single GCD (but for the full mana cost).
You'll also be able to set your Call of Fire to summon less than four totems if you like. Call of Fire will be trained at the same level as Totemic Call currently is, 30. At "higher levels" (I'd guess 60 and 70, or so) you get Call of Air and Call of Water, which do exactly the same thing as Call of Fire, but you can load them up with different totems. This gives you three different quick-sets of totems you can drop in one keystroke.
Well, shamans, what do you think? Is it everything you hoped for in a totem interface update?
Patch 3.2 will bring about a new 5, 10, and 25 man instance to WoW, and usher in a new 40-man battleground called the Isle of Conquest. WoW.com will have you covered every step of the way, from extensive PTR coverage through the official live release. Check out WoW.com's Guide to Patch 3.2 for all the latest!