He is looking at how 5e monsters might fit into Al-Qadim, but let me give it to you in his own words:
Take a look.Ray Chapel from Quasar Knight's Fantasy Blog wrote:The core al-Qadim products along with City of Delights mention the more common monstrous races, so I figured to write up some entries on other monsters (namely humanoids and giants) in the major 5th Edition books. Right now this blog post handles the core Monster Manual and Volo's Guide, but I may work on Mordenkainen's Tome of Foes and perhaps some 3rd party sourcebooks if there's enough interest. The Monstrous Races sourcebook and its sequel on the DM's Guild even provides balanced racial options for just about every official 5th Edition monster, further sweetening the deal.
What do you think of his suggestions for the Monster Manual and Volo's Guide to Monsters?
Would you like to see him do the same for Mordenkainen's Tome of Foes and other books?