A lot of rumblings have been going on the past couple of days. Rumors of a major Frontierland expansion have been said to be in the works, confirmed by multiple sources. I think this would be a great addition to the Magic Kingdom. It would definitely be something for males to counteract the FLE. Not to say that FLE is for girls but I think the majority of guys aren't giddy with join over making birthday cards with Aurora.
I think a great idea would to essentially match FLE's offerings, with Frontierland themes. An E-Ticket thrill ride or dark ride set in the wild west. An animatronic dinner show in a saloon, and then potentially a play area with M&G's ala Grizzly Trail. It would be smart to do this because that would really give MK some room to breathe again and allow Disney to focus on the other parks in the long term future.
I can't imagine they would be planning expansion here with the Fantasyland expansion already on its way.