Hmm ... I thought it was universal (except in Heathenson's universe ) that MMW were released in the first week or two of the month. Here's the release dates listed for all releases this year for where I buy online ...

Jan 8 - X-Men 5
Feb 5 - Dr. Strange 2
Mar 19 - Capt. Mar-Vell 1
Apr 9 - G.A. Torch 1
May 7 - Thor 4
Jun 4 - FF 9
Jul 16 - Avengers 5
Aug 13 - All-Winners 1
Sep 10 - Hulk 3
Oct 8 - Tales to Astonish 1
Nov 5 - Sgt. Fury 1
Dec 10 - Ant-Man

And the list goes back like that, month for month, all the way to the very first TPB MMW - Spider-Man Vol. 1 in Feb 18, 2009. But I wouldn't be surprised if all specialty comic stores got their shipments a bit earlier compared to online bookstores.