WOW Insider has done a nice summarization of what was learned at BlizzCon 2007. Here's the part we actually care about.

Hunters

  • Legendary ranged weapon coming
  • Hunters having to buy two arena weapons is a problem, and prices are being reconsidered
  • Hunter mana is being examined
  • Hunter arena representation is being examined for 2.3

I encourage you to check out the entire post, there's plenty of "interesting" non-Hunter stuff there.