http://teamrock.com/feature/2016-08-04/trevor-rabin-on-the-reunion-of-three-former-yes-members
A few days ago fans noticed that Gary Cambra is no longer listed as a member of the backing band on the official website, and subsequent mentions appear to indicate he is off the project. For example, in his latest GORR update Rick notes:
One thing that became abundantly clear was that Lee Pomeroy and Lou Molino III are much more than added “sidemen”. Their contributions to all that went on were immense and ARW is truly a 5 piece band of tremendous future potential.Last week there were also some photos in circulation on Facebook of singer-songwriter Brenda Russell and members of her band posing with Trevor and Rick, which led to speculation that Brenda might be joining ARW, but as I've noted in fandom discussion I believe the meeting occurred simply because both outfits were working at the same Los Angeles-area rehearsal facility (Russell and her band performed at the River Raisin Jazz Fesitval on Sunday). Rick's latest GORR also states:
What was very pleasing was the number of musicians who popped into rehearsals to say hello and said how fantastic it sounded - and I was only using one keyboard as my rig is in the process of being put together here in England.