In an interview at Computer and Videogames, Tigole mostly discusses some things we've already heard about, such as the Lake Wintergrasp PvP zone and the process to unlock the Death Knight class, but also reveals a few very tasty little morsels of new information as well.
First, he tells us a little bit more about Blizzard's philosophy behind Inscription, the new trade skill slated to be released with the expansion. While it appears that only one inscription will be allowed to be on a spell at one time, their goal is not to create one or two all-powerful inscriptions that will be used above all others, but to give players a variety of valid choices as to how to modify their spells. The example he gives is that of Frost Nova. One player might choose an inscription that gave their nova a longer range, while another might choose one that would lengthen the duration of the root associated with it.
And what's this? More hero classes?