idk about nick. mikey shoes has been playing bass with them for a while. he's a solid player and he can scream like nick when he needs to. from what ive read, josh and nick are on okay terms these days, but i'd be pretty shocked if he's invited back into the band. cant say i blame josh either. nick's recent arrest kinda vindicated josh for the rumors that he fired nick for beating his gf.
joey will almost certainly stay in the queens family, whether it's eagles of death metal, desert sessions, picking up on tour after dave leaves, etc. i gotta imagine its a bit of a confidence hit to be asked to step aside on the album though.