Samsung has started sending out invites for the Unpacked event this year, where it will take the wraps off the Galaxy S9. The date? February 25th. Its upcoming flagship phone will make its debut at Mobile World Congress in Barcelona, just like what DJ Koh, the Korean conglomerate's mobile chief, promised at CES. The teaser Samsung posted on Twitter hints at the S9's "reimagined camera." While the company didn't say anything more than that, one of the phone's rumored features is a variable aperture camera.