And Zarhym says it's still on track to do al that -- he specifically mentions that they've designed the battleground zone to supposedly be impervious to problems with realm imbalance, "trivial at the endgame," or "forgettable because of a lack of incentive." So if you hold a lot of faith in what Blizzard's working on, that would mean Wintergrasp is meant for 70s, has functionality that doesn't necessarily require a lot of players on both sides (siege vehicles come to mind), and will have an extensive rewards system (we've heard before that it may be token-based and equivalent to the level of current Arena gear).
If Blizzard is doing everything they promise to with Wintergrasp, it should be a sight to see for sure. A world PvP event that adds the permanency of the Auchindouin rewards with the mechanics of Halaa and the epic feeling of the old Southshore/Tarren Mill world PvP battles? We can't wait.