actually, that was a copy paste of our last patch. It was so big that the web page had to load when I posted it and when I went to edit the post : p
Someone had an idea a while back that I quite liked. You could have the game track each heroes ARAM win rate and then offer the heroes with very high win rates less often. Something else that might work is to take a lot of those super safe poke heroes that are powerful in ARAM and only have them show up in games with healers.
Those are some things you could also do with out straight up balance changes.