Where's that window?

So now that we know that the new Form 470 will go live tomorrow, the next question is, when will the new Form 471 go live?  On the first day of the filing window, I suppose.  When will that be?  The ESL is out, so USAC can pick a date whenever they like.

Which got me wondering: what is normally the delay between ESL release and announcement of the filing window?  The answer:

FY	ESL release	Window announced	Days to announce	Window open	60 days?	Window close	Window days
2005	10/14/2004	11/5/2004	22	12/14/2004	61	2/17/2005	65
2006	11/22/2005	11/23/2005	1	12/6/2005	14	2/16/2006	72
2007	10/19/2006	10/20/2006	1	11/14/2006	26	2/7/2007	85
2008	10/19/2007	10/28/2007	9	11/7/2007	19	2/7/2008	92
2009	11/21/2008	11/24/2008	3	12/2/2008	11	2/12/2009	72
2010	12/2/2009	12/3/2009	1	12/3/2009	1	2/11/2010	70
2011	12/6/2010	12/10/2010	4	1/11/2011	36	3/24/2011	72
2012	9/28/2011	11/22/2011	55	1/9/2012	103	3/20/2012	71
2013	9/27/2012	11/13/2012	47	12/12/2012	76	3/14/2013	92
2014	10/22/2013	11/20/2013	29	1/9/2014	79	3/26/2014	77
2015	10/28/2014	11/20/2014	23	12/27/2014	60

[I started with 2005 because that's when the Third Report and Order created the requirement that the ESL be released at least 60 days before the start of the filing window.]

The information in green italics is "what-if" data.  If USAC announced the window dates today, that would be 23 days after the ESL was released.  If the window opened exactly 60 days after the ESL release, that would be December 27^th.

This year is different, because USAC has to deal with a major systems overhaul before opening the window.  The Form 470 changes were very minor, but the Form 471 is a whole new beast.

So my uneducated guess on the window dates is:
Window opens: January 15
Window closes: March 25

That would give us a 69-day window, which is the shortest since 2005, but not a lot shorter than recent years.