Join Super Smash Bros. Finally Director Masahiro Sakurai on Thursday 16thth J anuary at 2pm (UK time) / 15.00 CET / 6 a.m. an almost 35-minute livestream with a deep DLC fighter screen. The fight will be revealed in the video.
To sign in, check out Nintendo UK's YouTube channel, where the presentation will be streamed live.
Source: Nintendo UK