Forgive me if I'm wrong, but I believe they said there will be weekly quests out of your Garrison that give you your bonus roll tokens each week. I believe they're ditching the "collect 50,000 lesser charms" thing and just giving them out as rewards for these quests.
:does a google search:
Okay, well, I can't find the actual tweet about quests in garrisons for bonus rolls, but here's a quote (and link) from an Ion Hazzikostas interview in May:
In WoD, there will be special tokens for bonus roll, which will be quite similar to the ones in MoP but their method of acquiring will be different.