I’ve got it all figured out boys 
Watch this…
"new" battlegrounds for Shadowlands
- Arathi Blizzard
- Packed House
"new" epic battleground for Shadowlands
- Southshore vs Tarren Mill
Now, I’m no game dev or game programmer, but I imagine it shouldn’t be too difficult to simply “copy-paste” these existing maps into the rotation. More variety is always a good thing.