Monday, June 8, 2015
Smash Bros Presentation coming June 14th
Nintendo's presentation will be Tuesday, June 16th, but that Sunday will be a separate presentation for Smash Brothers. 
Masahiro Sakurai will hots a video presentation at 10:40 AM eastern for some new reveals. Expect coverage on the addition of Lucas, new Miiverse stage, and new costumes featuring Splatoon inspired attire.
Any other upcoming characters could be saved for the official Nintendo presentation, but there could be more information teased or hinted at for furthering the roster.
 - Gameinformer - Masahiro Sakurai Is Hosting a Smash Bros. Video Presentation on June 14 - http://www.gameinformer.com/b/news/archive/2015/06/08/nintendo-s-e3-pre-show-is-a-smash-bros-presentation-from-masahiro-sakurai.aspx