After the UBL-NZM slip was cancelled in late 2020, Goa express was given one 3A and one SL coach, plus two HCPVs. It has had this CC for over a year now, so I doubt it will get any more coaches.
Besides, I've heard max 22 coaches are allowed for ICF rake trains running on Braganza ghat section, in addition to pitline constraints at VSG.