my predictions
Champion/item balance:
Weird ass nerf for Crits, will probably fail or be poorly implemented, mayor talk about crits, cirt dependant champions will either be garbage or Juggernaut tier overpowered for a while, mayor nerfs / buffs for Yasuo, Yi, Ashe.
marksman rework:
Will go two ways and will affect the following champions the most
Vayne, Lamb, Tristana, Lucian, graves: will be slightly overpowered to completely broken, any Arpen changes will affect Lamb Greatly, if they don't gut her on the pretence of "we want to force her into jungle" and deliver incredibly awkard and weird changes that ultimately will not adress core problems
Ashe, Jinx, Varus: will probably be buffed into oblivion by this change, get those thornmails ready
that will lead to:
The death of Juggernauts
Since ADC's will get reworked crits (probably some sort of % max HP damage :^) ) and as we all know, that doesn't go well with people that stack HP
Nerfs to the following items
BotrK
IE
Scimy (it will be a "buff" aka Rework, we all know how those go!)