Ken Fichtner is an honest man, and a history of sharing information publicly only after he has been given it by GM. Now that he has posted this in writing, am 100% sure that it is the most updated info out out by GM. Regarding previous posts, they were based on the most accurate information known as that time, and if I remember the posts you are referring to, neither quoted a top dealer like Chip's post above.
I realize you would like your car as soon as possible, but may I please add that even assuming your dealer is the very first one to file their order request, that could mean everything -- if they have large allocation and what you want is not on constraint, or could not mean anything if your dealer has only a small/medium allocation with the "big boys" submitting their orders by the end of that same filing period. If your dealer, for example filed first, but was not a top allocation dealer, it is not unusual for GM, when there are competing order requests, to prioritize those orders submitted by top selling/top allocation dealers. Again, GM decides which orders it chooses first, which fall to the second week of 2015 production, etc., and that may also have nothing to do with relative allocation, but everything to do with GM deciding, as an example, that they really want the new 2015 PDR's out there in customers hands as many and as soon as possible, or that they want as many of the new Shark Gray colored cars out there on the street, in customers hands as soon as possible. So, if my order were going against yours, and I ordered a VY car from the second largest dealer and you ordered a Shark Gray car from a medium allocation dealer, your order could quickly move ahead of mine, especially since you also ordered the PDR and I did not.
Let me please give a personal example of how this worked for me (but could have just as easily worked against me) when I ordered my 2006 Z06 from the largest allocation dealer Kerbeck. Dave told me I was # 56 on his Z06 priority list. We both expected I would not get it until late November or December, 2005 . I ended up getting mine the #1 (first) NCM Museum Delivery C6 Z06 in September. How did I pass by 55 others ahead of me in line (when all of them were also Kerbeck customers)? I ordered painted silver wheels, and the others all other either the polished aluminum wheels or some other wheel. However, GM rejected, for lack of quality, the new wheel supplier's polishing and send the first two batches of polished wheels back to the supplier for re-polishing.
Sorry, but this whole ordering/receiving process is a very, very, very inexact one, with all of us subject to so many factors totally out of our control -- and with potential supplier issues always a possibility, GM is too often subject to factors out of their control. I have had my deposit in for my 2015 Z06 since last June 1st, so I know how horrible waiting is, and know my Z06, even though priority # 2 at MacMulkin (2nd largest dealer) may not arrive until literally a full year from now. Waiting sucks -- no two ways about or around it. And the fact that the whole process is inexact, not under our or our dealer 's control, makes it even harder.