My biggest suggestion, and one I've been waiting to happen for YEARS is CUSTOM SKINS! Me and my friends are dying to get them, and if they don't come soon, we will easily get bored and tired of Minecraft.
You see, me and my friends LOVE roleplaying. We have Custom Elder Scrolls maps, Fallout maps, City maps, etc, and we've been making due with what we have for 2-3 years together now. We've been crossing our fingers and praying for custom skins so we can be our own unique characters, and to show off our creative skill with cool skin creations. We are tired of using plain old skins of people "Close enough" to what we are going for as a character or as a style.