We are aware of the fact that Samsung would be unveiling their upcoming flagship device Galaxy S6 at the MWC event scheduled to happen on March 1st. Many relevant leaks have already given us the idea of the physical nature as well as the power integrated in its chip of the Samsung Galaxy S6 and the S6 Edge.
The most recent leak reports the sale date of the smartphone. The source says that as per a purported leaked internal memo that they have received, which reveals blackout periods for employee vacations and the dates count from March 22nd and March 30th and the next period being April 19th and April 27th.
So assuming these blackout periods as the time-frame for the release of these devices. Or things could be like the first slot is being for the Galaxy S6 and the next one being for Galaxy S6 Edge. The source also said that the second mentioned dates, i.e. April 19th to April 27th could be specific to Galaxy Note tablet.