Let me join the conversation and give you some feedback about shipping dates in Germany (I am sure things are the same in other EU countries).
Thomann and Music Store have both received a bunch of units in January, and so have some of the smaller shops. Considering the size of shops like Music Store and Thomann (and Just Musc and Session Music and Hieber-Lindberg and so on), the list of pre-orders is probably quite long.
So if Music Store or Thomann (or any shop) changes the "date of availability" from February to March, it does NOT indicate that they will get the first or next units in March. It only indicates, that NEW orders will PROBABLY ship in March (they might be shipping sooner than that).
German shops (including Music Store and Thomann) will get units in February and will be able to process their list of pre-orders in February.
The reason why you see some users receiving a MatrixBrute while the "lights" are still red in the shop's product page is that Arturia is shipping in small batches and they are trying to cover many countries at once. So there are a bunch of units in the UK and some in France and some in Asia and some in the States and some in Germany and some in Austria, Switzerland, Italy, Spain ...
But since Arturia could ramp up the production (units build per day), more units coming in fast now and I assume that the situation will be getting much more relaxed during February and March.