You can expect to see an end to all these teases when Samsung officially unveils the Galaxy S6 on March 1st. T-Mobile's website says there'll be much more to share on that date.
From the front, the Galaxy S6 looks a lot like the Note Edge — though this time both sides of the screen feature Samsung's unique curve and dark gray metal backside
It'll be unveiled on March 1 at MWC with a release likely in April 2015. The Samsung Galaxy S4 and S5 both launched in April, of 2013 and 2014 respectively, so it's probable you'll be able to buy the Samsung Galaxy S6 from April 2015.
— SamsungMobile (@SamsungMobile) February 20, 2015