If I had to 'guess' Andrew - I would say they will go for the 31st for POTCO's b-day...
Will the bugs be fixed by then, I donno.
If I had to guess, I think their first focus was to fix the Ship Grapple Invicibility Glitch, and that didn't go so well for them (yes it fixed the glitch, and brok all the NPC Ships from being able to sail - I don't think that was part of the plan).
Their second focus was to change the Dagger abilities, and they broke the Hex Shot in doing so (once again, I don't think that was part of the plan...).
In implementing these they broke the chat, which I'm sure wasnt planned at all and they had to turn around and still try to fix that...
The French and Spanish Undead NPC mess I'm sure wasn't planned either (maybe part of their boss implementation, these got messed up).
In their attempt to fix several bugs and implement the boss features (which the DEVs deserve credit for as it is time to step back, and put the game 'in order' before adding big new content) they caused themselves a few headaches which now must also be fixed... will they fully finish by Oct 31st? Hard to say...
Recoding all these fixes on top of fixes is gonna take some time - they just makde double work for themselves and they gotta do a lot of code shuffling before release.