I hope 343 will consider changing the way map voting works; make it so that once a map is approved, it cannot be voted on until all of the other maps have rotated at least once. This will make it so Big Team Infinity Slayer is not just 24/7 Ragnarok.
Something I would also like to see later down the road is 343 developer picks for Forge maps. Their personal favorite maps being added to the official playlist rotations. I know there are 3 map packs coming out, but no one cares about DLC map packs in first person shooters. The last time I bought DLC for a FPS, and this was a call of duty title, there was barely anyone playing that map pack; it sucked.