Only downside to releasing chests within the game through the realms is us higher level players have more access to more realms and more of those chests. You would have to limit us in someway to make it fair to the lower levels, and those with less stamina. Plus it would need to be something they could code quickly.
You can make it part of a quest and then it would be limited(being a seasonal quest), as a reward for completion you could get lets just say 2-3 keys(or tie the keys into the global with tier qualification, having to talk to the quest giver to get the keys unlocked for the selected tiers) and access to a vault of chest where you can choose between a few chests all with their own random skill potions, frag stashes, arena token stash, or even a ladder token stash then every playing style has a chance to win something they could actually use.
For instance,
Open Frag chest for a random frag reward(Frag number and type would be random)
Open Arena chest for random token stash(Amount of tokens would be random)
Open Ladder chest(Similar to arena chest tokens would be random)
And you would be able to use all your keys on one chest(reward per key), or select between the different types.
One draw back would be the tokens and being able to profit off them, but if they are not outrageous in the amount they give it would be ok... since you can profit off of skill potions through hunting, farming, titan hunting or what have you. I guess it would just depend on your outlook on that kind of matter.
You can make the qualification for the quest so that the person must qualify for the minimum amount of global kills in order to start the quest(2k kills minimum something simple or make them count as 2 kills per kill). Killing the Mutated Egg(Global creature), which could be considered an egg hunt just hunting bad eggs. New item for killing the new globals could be an Egg Beater . You can either make it to where you get 1 key for tier 1(bronze), 2 keys for tier 3(gold), and 3 keys for tier 5(ruby) qualification. Or you just get all 3 keys or whatever for just qualifying.
But with some special chests in the future i would like to see something similar to the freedom we have with composing, select you own buffs for your chest from a predetermined selection of buffs and durations of them from HCS. Right now we are able to select between potions, so it would be the same concept you would just frankenstein your own special potion. That could save people from having to overlap 2 or 3 chests to get their desired combination as they have been doing. Right now the global potions are maxed at 6 skills, we can keep that just add more buffs to the mix(like our 2k+ buffs with levels within reason). But this thought may have to be for another day and a different forum post