The Samsung Galaxy S9 and Galaxy S9+ will be unveiled this Sunday and they may be on store shelves less than a month later. Korean publication The Investor cites sources who claim that pre-orders for Korea's major carriers will start on February 28 - the Wednesday after the Samsung Unpacked event. Global sales are set to start on March 16, though those who've pre-ordered will probably get it the week before (that's for Korea, it's not clear if the global pre-orders will ship before the 16th). There's no new info on the pricing - last we heard, it would start at 910/£740 for the Galaxy...
Source: https://www.gsmarena.com/inside_sources_samsung_galaxy_s9_duo_to_launch_on_march_16-news-29716.php