I've been loving AoS since release. The GH was a great addition and certainly has made both pick up games and tournaments far better. Some great thoughts from everyone on the forums. Here are mine.
1. Base to base measurement needs to be official. Too many games have been ruined due to a discussion of zombie dragon wings. Give us the recommended base size for every model on their warscrolls.
2. I think there should be another unit type. Right now we have four: leaders, behemoths, artillery and every thing else, some of which get battleline either as base or in some combo. As the game evolves competitive play will benefit from an additional type that can be restricted for balance. Elite is what I would recommend knowing that the restriction can always be broken with formations.
3. I would like to see a change to unit formation as it relates to heroes. I want a hero to be able to join a unit. Ideally a hero would get protection from shooting and melee while giving the unit a bump. I am not talking about the independent character rule from 40k. Instead having a hero be part of a unit, bought separately but only playable together. I think having the heroes only being able to join a specific unit type would be the best. For example a mounted hero would be part of the cavalry unit only. Heroes on behemoths can be part of a unit at all. Heroes cannot decide to leave, their fanatical guard just won't allow it! This leads into my final point about shooting...
4. Heroes are exceptionally vulnerable to shooting, hence 3. I also want to see a change to shooting into and out of combat. Here are my thoughts. Shooting into combat: if you shoot into combat all engaged units would have to make a battleshock roll using the number of models removed for the roll. This would represent the chance of accidentally hitting your own unit. And could easily become a neat mechanic of elite sniper troops to give their own units a bonus to that battleshock roll. Shooting out of combat: only models out of melee range should be able to shoot.