The game looks very good, but I'm not expecting a mass exodus and I have a huge backlog of very good games I paid $5-10 for, so I'm not likely to fork over full price for this. I'll definitely pick it up when it's cheap, but that could be a while.
(Also, planned or not, Blizzard did an excellent job of scheduling interesting but low-risk stuff on top of the GW2 release date, while still making it possible to play GW2 for a month and then pick up pandas at launch.)