The patch 3.3 PTR is up (as you must have noticed if you're reading the same site I'm writing on), and among other things, it contains a battery of crafted gear that confers nature resistance for users of the various armor classes. There's leg and foot wear for all armor types, in various versions where appropriate (like DPS/tanking/spell for plate).
This is a pretty good sign that we're going to want/need nature resist somewhere in Icecrown Citadel. The mats list is another hint in that direction, calling as it does for Icecrown Thing of Crafting Things [PH]. It's a good thing they put "PH" there, or I might not have known the name was a placeholder.
But seriously folks, get ready to craft another set of resistance gear. I'm not particularly jazzed about this myself - I mostly raid as a druid these days, and we have little enough bag space as it is - but I guess it's one way to make sure players don't consume the content too quickly (if they have to stock up on Things of Crafting Things from earlier bosses first). Still seems like a silly hoop to make us jump through.