I just checked my order's through Best Buy and both say this;
Status: Pre-ordered
Expected release date: 03/11/2016
I ordered two Titanium's (AT&T).  Both phones were ordered at the same time/date.  Feb 23rd right around 8:15 ish.  Maybe going directly through a carrier is allowing for faster shipment.  I'm OK waiting until the 11th or a day or so after.  I've waited this long for the release, so what's another couple weeks?  I'm just excited to get it.  I'm coming out of a S6 edge.  I personally love using the S6.  The camera is my favorite feature of this phone so making use of the f1.7 is going to be great with the S7.  I only use the edge screen now as my clock when I'm in bed.  I have it set to automatically shut off at 6am.  So when I hit snooze several times in the morning and don't see the clock anymore, I know I have to get up!  The always on display is a huge plus!