TFT Update plans

I was wondering if there would be some insight as in what is the update plan for the game. The game is fresh, and despite a certain amount of bugs, seems fairly polished so far; the game is clearly not on his beta stage anymore. So is there plans of adding new Champions, what would be the frequency of new releases? New items? Game mode (PvE, Coop, TeamVSTeam, ranked mode, custom games,...) I am simply very enthusiastic about the game and I'd like to know more while waiting to get in...
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