I kinda have to agree with Morello. League's balance is entirely around 5v5. Nerfs, buffs, new content, reworks -- most of these are for the sake of improving or stabilizing summoner's rift. When certain champs excel in TT, ARAM, or Dominion and utterly suck in SR(champs like Poppy and Shaco) or vica versa, you get to see a growing trend: there's only room for one.
And see, that's a problem. A rather big one, in my opinion. One of HoN's selling points is the fact that it had... 5-6 maps. All perfectly balanced for any champ, any team, anytime. Sure, it comes with the territory of the popular flaws from dota people love to bring up(CC too long, hypercarries, etc.), but League has flaws too. And one of them is that many, MANY features are dropped for the sake of "true balance".
The game is digging itself into a hole, really. The meta works too well. Only one map is viable. Roughly a 3rd or 4th of champs available just can't be realistically used in 5v5. And as much as I want to think that new maps would magically make this game better.... they won't. It just doesn't work that way. I'm sorry folks, but if you don't think a new map would be a nightmare to "perfectly" balance then you don't know this game very well. And yeah, I suppose Riot could get by slipping something new under the table, but it'll only be as good as Dominion/ARAM/TT: an alternative to SR, but certainly not a replacement; nothing you could take a tournament.
In closing, we need to kill off this stupid-ass solo top, jungle, mage mid, adc/support bot meta before we can think of new content.