I don't think this has been asked yet. But, if it has, I apologize for repeating.
It's been stated that Dominion is going to be a much shorter game time than Summoner's Rift. I'm 100% okay with this idea, it gives people with less time another option.
My question's this: Twisted Treeline takes less time than Summoner's Rift, but requires less people. And you get less XP/IP for it. Will Dominion also have a reduced XP/IP? I'm just not sure if the reduced reward comes from the time commitment, or from the reduction in people.