Going through the released notes, I bet 1 $ that the new "currency" to use at vendors will be actual money, the micro transactions are in motion...that is the next big patch from destiny....no real voice chat, in game clan options or matchmaking....just squeezing money out of you....
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I bet 1$ that it will be new ways to exchange marks for mats. Since you already have a mats to marks exchange plus more ways to spend motes and glimmer that's what I see but that's my naive 2 cents