chess.com is hosting the Carlsen v Nakamura Grandmaster Blitz Battle Championship today. Unfortunately for Australian fans we are in the most difficult time zone, with the match due to start at 4am and finish around 7am. The format is a mix of 5m+2s, 3m+2s, and 1m+1s. The match isn't of a fixed length, rather being of a fixed time, with 5m+2s going for 90 minutes, 3m+2s for 60 minutes, and 1m+1s for 30 minutes. Based on the preliminaries, there is usually 20 to 30 games played, even if one player has an insurmountable lead.
However if you read this post in time, and are up early enough, it looks like it is worth watching, as there will be live commentary, a video feed, and competitions for spectators. As for the likely winner, I would normally tip Carlsen, but for this one I'm going to change my ways and suggest Nakamura is the slight favourite, mainly based on the amount of online blitz he plays.