Kat is correct. Corday's interview ...well, he tries to explain how it seems many leaving at once, but the shut downs changed things. He said that Greg Vaughan's (Eric) departure was known (back in Nov.) and they could not do anything about that. He said the show had not been picked up, so they felt it not fair if the actors were not free to do something else if they chose. Then they were picked up on contract.
Kristian Alfonso (Hope) decided to leave, they asked her to take 4 mos. off, & then have great story, but she decided to leave. He says something vague about Rafe & Gabi leaving but are returning, and then that Victoria Konefal (Ciara), Chandler Massey (Will) & Freddie Smith (Sonny) will go, & come, go and come.
There is also interview with Ron Carlivati, head writer, who mentions Sami returning for a longer time, Ava returning (not so evil). He also mentions how the cancellation of Olympics meant the holiday stories were gonna all be earlier, so they decided to insert a small story that fit with whatever was going on (in October) so the Thanksgiving and Christmas time will be back in place for those days.