The devs confirmed there will be no new toons added to the arena store, gw store, or cantina store. Once you have 7* all of them it's pretty much a shard shop currency zone.
Designed to just be a shard shop currency source for the late game player. At least there is prestige and credits in the arena store, and ship blueprints available from GW store offer a better shard shop return than character shards.
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Cantina, arena and GW stores aren't getting anything added to them. See Dev Q&A https://forums.galaxy-of-heroes.starwars.ea.com/discussion/163161/swgoh-q-a-w-producers-3-17-18
Designed to just be a shard shop currency source for the late game player. At least there is prestige and credits in the arena store, and ship blueprints available from GW store offer a better shard shop return than character shards.