There are some lucky T-Mobile customers out there right now. A few of the T-Mobile pre-orders for the Samsung Galaxy S6 and S6 Edge have already started showing up on doorsteps. Apparently, T-Mo was able to ship out a bit earlier than they estimated. There were even a few extremely fortunate folks who received theirs as early as Saturday morning.
More than likely this was some error on the part of T-Mobile because the devices weren't supposed to hit doorsteps and retail shelves until April 10th. I am sure the lucky few who have theirs already aren't complaining.
Source: XDA
Here's our dedicated Samsung Galaxy S6 and S6 Edge section: Samsung Galaxy S6 and S6 Edge General Discussions Android Forum at DroidForums.net