I think it will be the best in a long time, for all three companies.
Sony will put on a good show, I'm sure. They "won" last year's E3, so there's no reason to think they would bomb in 2013, considering upcoming games for PS3, PS4, and Vita.
Nintendo, I think, is the front-runner to "win" this year. We're almost guaranteed to see the following three games in some form -- Super Mario, Mario Kart, Super Smash Bros. -- plus the unveiling of Retro's game.
Microsoft, as some have said, is the wild card. Theirs was the weakest of the three presentations last year, but I'm sure they have a ton of surprises for us in 2013. If Microsoft shows off all these new IPs its been working on, it might really turn some heads.










