Here's my updated 'All Fixtures' page:
https://docs.google.com/spreadsheets/d/1n56H8Ds5CCLGtlzZFwkfv3kBrgzZunDotlOxbVtNCKk/edit#gid=2034442737

The GW13 Blank (MID vs MUN) is confirmed.

The Leeds Blanks in GWs 15 + 16 haven't been officially confirmed yet, but they'll almost certainly happen.

Here's the League Cup draw and schedule up to the Quarterfinals.

We now have two confirmed DGW fixtures in GW15:
AVL vs SOU
BLA vs LEI

And that League Cup Quarterfinal draw has increased the likelihood of us getting a massive DGW in GW15.
Here are the permutations:

Here are the permutations for all the potential DGW fixtures.

You can see which fixtures these DGW fixtures would pair with at the top of this thread.