Originally, Blizzard had mentioned in their announcement that additional character slots would be available with Remix: Mists of Pandaria. As Remix plays on normal realms, players are limited to the existing 60 character limit per WoW account.
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Blizzard removed the mention of additional character slots to be available with Patch 10.2.7 from their blog post. This likely means this change won't be happening with Timerunning: Pandaria.