A few weeks ago I was listening to an archived interview of Douglas Moo from last year conducted by Darrell Bock as part of Dallas Theological Seminary's The Table podcast and Moo indicated the NIV is actually undergoing a revision right now.
Below is the relevant portion of the transcript which was discussing the process of making revisions and updates:
Darrell Bock
And do those changes come out as revisions are made, or do they come out and were produced as each printing comes along?
Douglas Moo
No, only in a revision. So, again, we have a revision in 2011. We’ve accumulated hundreds of revisions since then as we’ve met every year since. And at some point, maybe in the mid-2020s, we will produce another revision which includes all of those.
If interested the entire interview can be found
here.