Thanks to the eagle-eyed efforts of the Yesfans community, advance notice is beginning to appear for fall tour dates, and it does look like the tour is starting on the East Coast in October. No official announcement has been made but it's not necessarily unusual for information to precede validation, as it were. The existing caveat is that neither of the dates thus far advertised are listed on official websites for the venues.
The ensemble is being billed as "Anderson, Rabin & Wakeman - An Evening of YES Music & More," according to an ad in the New Jersey Star-Ledger for Borgata Casino & Spa in Atlantic City It appears their US promoter is Larry Magid Entertainment, someone with well-known ties to Live Nation - which does have a placeholder page for ARW on their official website but no dates listed at this time.
Within the past three days at least two dates have been advertised; an ad in the latest edition of The Village Voice (4/27) for the Wellmont Theatre in Montclair, New Jersey lists ARW as appearing on October 24th. The date listed for the Borgata Casino appearance is October 26th.