The early game changes they are making seem really interesting for competetive.
"Couple of things planned:
1)Make towers acknowledge calls for help if the ally being hit's outside their range, but the enemy hitting them is under the tower. At present it's unintuitive and really punishing that if you're zoned really far back from your tower enemy champions can stand under it and hit you without risk.
2)Give towers some concept of champion aggression memory. Basically towers won't go back to shooting minions until there aren't any enemy champions in their range who've recently damaged one of their team's champions. Main impact of that is expected to be on champions that dive at low levels using untargetablity effects (Elise, Fizz etc). The ability to swap agro onto another champion's still there and still powerful, trying to defend a tower in those circumstances shouldn't be as lopsided though (risk just isn't there for the attacker at present). As with lane swaps we don't want to remove early tower diving, we don't think the risk being taken/price being paid's high enough though, leading to a situation where you just don't bother trying to defend at all (tower still goes down, you just go down with it)."