Twitter's IPO Date:

Twitter Eyeing November IPO:

An early version of Twitter’s S-1 states the company’s IPO lockup period ends on February 15th. These lockup periods typically last 90 days, so backtracking from there an IPO on Friday November 15th would be likely. This would be just in time for you to gift Twitter stock for Thanksgiving or Christmas!

You can read more about the IPO details here and here and how they caused Tweeter to jump nearly 2,000% here.