The Annual Pass was great value the last time around, it saved me a lot of money. It wouldn't save me as much this time due to my cancelled WoW sub, but I'd consider it still depending on how expensive it would be.
There are two main reasons they won't do the annual pass this time:
1) CS headaches the last time (cancellations, the "you're in Beta" outcry)
2) Expac probably due in 6 months; last time they were looking at 10-11 months.