I've seen a couple of them offer kobans by now. Both times they were marked as epic, just like that one. One was worth 6 and the other was worth 3.

I've also been noticing that it seems like the mission rewards are actually completely random, and I think it also decides at random if it will mark missions as rare / epic. Probably with a limit of 2 rare missions and 1 epic mission showing in your list of 5 missions. (I think I might have seen at least one mission repeat as a different rarity.)

I also saw a new addition the last time I completed my dailies where it's now giving one more random reward after completing all 5 of your missions. (Mine was just a common magazine. But whatever.)