Will we ever see a consolidation of creature types? We have a few examples that encompass the same theme (devil/tiefling/imp for example) that seem to only hinder players trying to keep to a certain tribe.

It’s the age old conflict of Vorthos vs. Mel. Vorthos likes lots of variety, and Mel wants everything consolidated.

I'm positive you've been asked similar questions before, but what goes into the process of making new creature types that could be another type. Like Nagas instead of Snakes, or Gnolls instead of Hyenas, or in reverse where Demons are used instead of Tiefling?

It has a lot to do with the equity of the new word. Werewolves could have been Wolves, but Werewolf had a lot of equity, making it more appealing.

Hey Mark, could cards in say a commander product reference the D&D creature types even though they aren't going to be really supported in the rest of Magic? Like a card that gives +1/+1 to Azra, Tieflings, and Devils or something similar?

I don’t expect us to reference Tiefling outside a D&D set.

Now that we have actual Halflings and Tieflings in magic, is there going to be a creature type update to make the Kithkin and the Azra (who are halflings and tieflings, respectively), officially halflings and tieflings?

D&D unique creature types will stay in D&D flavored sets.

So with tieflings now in the game, does that make Azra obsolete as it was made specifically to show that type of race, or how is that being handled?

Certain races are specifically a D&D thing.