Twitch is getting more TikTok-ified with vertical game streaming. Also, "2K" (1440p) video will let you watch that League of Legends stream in a higher resolution. The ability to rewind streams is coming, too. CEO Dan Clancy made the announcements on Saturday at TwitchCon Europe.<br /> Portrait-mode streaming makes it a little easier to watch gameplay on your phone. Until now, Twit [...]