Potentially returning to LoL after a year's absence

So, stopped paying attention to the game just before Yorick's rework was released. Burned out, had other things to do. Now I'm curious how League is doing in the current year(tm). I assume the general top, mid, adc/supp bot and jungler meta is still ironclad as ever, but surely there have been other developments; apparently there's a new player leveling system? The game is especially snowball-y, with high damage and quick matches? If you have an opinion on how the game has changed over the past year (for better or worse), do share.