I always found the in-game infos given (not only about the imps) lacking.
Why not, for example, add the current imp infor to the event tab, there is only 3 tabs used so plenty of space, giving info which imp is in chests, clarify in which chests as well as the time left.
I really dislike things like “soon” or the imp thing, “last chance”. Same with “troop will be added to chests in 3-4 weeks” way? is there something wrong with picking a clear 3 OR 4?
This may help ppl about the imps a bit:
Sometimes it seems it gets changed on the 1st of a new month but sometimes it gets delayed to a friday so ppl pulling for the new mythic get the next seasonal imp.