Q:
Special items in BL chest in the future?
Probably not. With the South Sun crates, they’ve shifted away from stuffing new content into the BLCs. BLC keys can be farmed, and they know it. With the current system, they can leave that alone and still generate revenue hand over fist (so far as I can tell) from RNG “boxes of the event” without fear of people farming to any relevant adverse effect. Unlikely there’s a reason to save them for any special events anymore. However, it might be wise to reserve them until Halloween (or Thanksgiving, perhaps) rolls around again, just in case. If there isn’t anything new added to get from BLCs and we get “Pumpkin Pots” (and “Mega Pumpkin Pots” in the gem store) or whatever instead, then you’ll have a pretty good answer for the future.
Having said that, there are still (I’m hoping) some good things hiding in BLCs, they’re just rare as hen’s teeth.
Considering dragon coffers are a lot easier to farm than BLC keys, I’m not sure that the shift to special event boxes is due to the ability to farm the keys. (Admittedly, the southsun crates were not as easy to obtain).
As for the future, that’s hard to say, I suspect we’ll see more specialist RNG boxes, but I’d wait to see what they do for Halloween just in case they go back to using the BLCs.
Honestly, how many keys could you farm in say an hour? Compare that to number of regular dragon coffers that drop.
RIP City of Heroes