Donation Camps and maybe donation barracks
Have you ever had a full army, and then a clan-mate requests for troops? You just waited however long for your perfect army, and don't want to donate them away and have to cook them again? With this new donation barrack(s), one could be able to make troops that go directly to one or many donation camp(s). Depending on what number of donation camps would be an acceptable amount, one could train any troop in the donation barrack, and have the troops go directly to the donation camp.
With these new buildings, I think it encourages people to donate more frequently, and with better, longer-to-make troops. Instead of donating out your army, one could make troops specifically for donating, and not coming from army camps, but donation camps.