I played one Arena game and client broke in stats screen. I reopened the game and saw Nexus Blitz casually sitting there between TFT and Arena. I got so exited and tried to play, but after the game began the server froze and the clinet kicked me from the game (but the game window was still there for some reason). I just got bamboozled by Riot there. So, what this is: a little bit of trolling or an unexpected teaser?
UPD: It's got removed.
UPD2: Porofessor still thinks that i'm in NB. For one hour straight. Tough game, huh?