We will probably see the first R4 materials during cyber weekend or in banquet milestones, but we are still likely months away (maybe spring cleaning or July 4th) from actually seeing the first R4. But we won't know until we see materials. R6 is at least a couple years away.
I'm hoping to god that we don't see r4 materials until like 2026. We got 6* r5s and 7* r3s in the same year, we are moving way too quickly for new rankup levels.
I feel like future ranks for 7 stars will be released in the same manner as R3, that is everyone regardless of whales or F2P will have access to the rankup for enough effort. After that R4 materials will begin to be injected into deals
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No need to rush.
It will kill the momentum as we already struggle for r3 mats without deals/endgame content
The moment 7r4 comes, 6* will be DEAD.
Kabam knows it and one thing Kabam loves is selling new released 6* heroes, so there's that.