I wonder if the "timeline" process between now and the date of release will be similar to how the "timeline" was for the first set.
Here is the time line for news of the first set(going by memory):
November 2005: somebody gets an e-mail from Sesame Workshop that confirms that Sesame Workshop was getting legal clearances for a Sesame Street nostalgia set, but states that it probably won't be released until at least 2007.
April or May 2006: Somebody gets an e-mail from Sesame Workshop stating that there are official plans for a set, I think it was said then that it would come out in October (so much for waiting an extra year). Shortly afterwards, Amazon (or was it another website?) puts up Old School Volume 1 on it's website, giving Ocotober 24 (or whatever the official date was) as the release date.
June or July 2006: A website (it could be Amazon) has a page for this set, listing it as "Sesame Street Nostalgia: First Five..." (at cut-off). This leads to a brief two-day rumor that the set would have the first five episodes.
August 2006: The cover is shown on the internet for the first time, confirming that it features material from 1969-1974. Shortly later, TV shows on DVD gives a press release, announcing that it would be athree-disc set, with fve epsiodes, 45 bonus segments (which later turns out to be 54), and the original pilot (which ans speculate is the pilot pitch that ended up on the set, but soem think it might be one of the test pilots).
September 2006: It's confirmed that the set will have the first five season premiers.
October: Sesame Workshop puts up a trailer for the set on it's website, and puts up a few press releases. In the weeks before the set is officially released, somebody at Muppet Central, gets an advanced copy and posts a review at Muppet Central (though information on what bonus sketches are included is first listed at Muppet Wiki).