A Glu Admin, Popcorn, has said there will be more available in time. The rifle series is a part 1 of 3 events for R8. There will be another series and Trophies added next week, and the week after that. I don't know if and/or when exotics will be added. R8 was released in the style of the "Evil Rising" event in DH14, with a new series appearing each week.
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I have contract hunts. Finished trophy hunt already and almost through rifle series. No shotgun or bow series? Same old same just with flames
It's not done yet, they'll be adding more soon. Don't you read the above threads?