Going with everything WotC publishes, maybe a new boxed set for the Forgotten Realms?
But seriously, other than all the work on MtG, what is Wyatt best known for? What is most likely for him to be working on that is not MtG?
From Wikipedia:
"
Wizards of the Coast ultimately hired him in January 2000 to work on the
D&D game full-time; his first assignment was
Monstrous Compendium: Monsters of Faerûn, of which he wrote two-thirds.
[2] His other early works for Wizards of the Coast included
The Speaker in Dreams (a core adventure on the original
Adventure Path, following
The Sunless Citadel and
The Forge of Fury),
Defenders of the Faith, the monsters chapter in the
Forgotten Realms Campaign Setting, and numerous articles in
Dragon and
Dungeon.
[2] Wyatt wrote
Oriental Adventures (2001), a setting book that Wizards had in process for over a year, and which offered new rules for Oriental realms, some of them specific to the world of
Rokugan.
[3]:265 He wrote
City of the Spider Queen and co-authored numerous roleplaying game products, including
Magic of Incarnum,
Sharn: City of Towers,
Draconomicon, The Book of Dragons, and
Book of Exalted Deeds.
[4] Eberron was introduced with the
Eberron Campaign Setting (2004), produced by
Keith Baker alongside Wyatt and
Bill Slavicsek.
[3]:294 Early in 2005, Slavicsek organized a team to work on some early designs for a fourth edition of
D&D, which was headed up by
Rob Heinsoo and also contained
Collins and Wyatt; Heinsoo, Collins, and Wyatt formed the core fourth-edition team.
[3]:297 Wyatt was on the SCRAMJET team, led by
Richard Baker, and including
Matt Sernett,
Ed Stark,
Michele Carter,
Stacy Longstreet, and
Chris Perkins; this team updated the setting and cosmology of
D&D as the fourth edition was being developed.
[3]:298"
"He wrote the
D&D novels
In the Claws of the Tiger (2006),
Storm Dragon (2007),
Dragon Forge (2008),
Dragon War (2009), and
Oath of Vigilance (2011)."
"In 2014, Wyatt left
Dungeons & Dragons to work on the writing and creative aspects of
Magic: The Gathering."
The article doesn't discuss his Next and 5E work, but he was the lead for the current DMG, and did the development work on Monster canon in "Wandering Monster" articles.