So for the last few days I've been reading the Official Beta forums, and I've come away with a really eerie feeling. Everything seems to be in limbo in terms of balance, nothing seems finished. Developers admitting to flaws in basic mechanics, or core class mechanics. I don't mean in the sense of updating a few spreadsheets, but reworking core ideas.
Now I understand that developer's willing to admit such information is great, but the degree of issues presented is staggering. Reworking multiple mechanics form basic to core across multiple professions is a huge task, not to mention non balancing related development. The level of Optimization required itself seems staggering, that it would take 1-2 months to fix alone.
The game definitively seemed polished to a certain degree during beta, but as you read the beta forums, there's a new issue in every thread. These aren't unsupported issues either, most present legitimate points, and are hard to ignore. Ranging from animations issues, action queuing, various issues with various weapons, utility skills, followed by bugs. Developer's then saying " Yah its broken, we don't know what to do about it" isn't reassuring either. The fact that all pet/companion A.I has been broken for the last 3 beta tests is a sign of just the technical difficulties still present.
All PvP being available to everyone 10 mins into the game means they can't release with such issues present. This game has to be well balanced on release, more so then any previous MMO, otherwise it can have some awful effects.
Further more no one has any concrete information about the status of the completion percentage relating to game content creation. Early rumblings don't seem to be as positive as everyone thought.
Now when you add in the technical touches still needed for Guild Wars 2, I really don't see this releasing anytime before September at the earliest. I would probably say November, maybe December if they want to get out of the way of other major titles.
I believe this new Combat system is giving them a lot of trouble right now, and its just starting to bite them in the ass. They might of been overconfident due to the CBT, and general positive vibe they gave off.