Bungie has responded to concerns that they could add microtransactions to Destiny for consumables that increase item drop rates from the King's Fall raid, by saying that this is something they aren't planning.
This week, Bungie opened Destiny's microtransaction store, allowing players to buy a currency called Silver that can be used to purchase new emotes and dance moves, including the "Enthusiastic Dance", better known as The Carlton. These are purely cosmetic, but people datamining the update found details for consumable items that go beyond that, including a level booster, an item that instantly unlocks any subclass, and consumables that increase raid drop rates and experience from certain enemies.
Since that rumour broke, Bungie's Luke Smith has responded by saying on Twitter that "We aren't (nor are we planning) on selling consumables that buff King's Fall drop rates for Silver." He went into more detail on NeoGAF, explaining that the items increasing King's Fall drop rates were never designed to be purchased with Silver, but rather would be sold by the Speaker for Motes and Planetary Materials. Ultimately, though, these items were scrapped for "bug-related reasons".
Smith hasn't addressed the other items found in the patch data, which some are taking as confirmation that they will be added at a later date. It's worth noting that such items are not unusual in massively multiplayer online games, both free- and pay-to-play.
Since introducing the microtransaction store, Bungie have gifted all players 400 Silver - enough to buy two "rare"-level emotes, but not quite enough for The Carlton - so they can try out the store.