What we think we know about Emory Van Zant
She (or he) has been trademarked by American Girl. Past patterns have been once a doll has a trademarked first and last name she/he is pretty much a guaranteed go.
Emory is probably not a WellieWisher as those dolls are first name only trademarks.
Emory could be GOTY 2018, though since it is rather late in the year for a GOTY trademark it is more likely she/he is a new Contemporary Character.