Korra Creators Confirm Korrasami is Canon

Both Bryan Konietzko and Michael DiMartino have written blog posts about the nature of Korra and Asami's relationship, confirming that the Korrasami ship is canon.  A section of Koneitzko's post is featured in the image above, but you can read both of their thoughts in full here and here.

Sorry Makorra shippers, but you're just gonna have to deal with it.