Alvaro Morata has been one of the most rumoured players to leave at Atletico Madrid. The rumours have been coming from everywhere like from European teams to Saudi Arabian teams. But still there is update on that lately. Felix's returning to the team has raised these rumours. Felix is also in these rumours so maybe one of these strikers can really leave before the transfer window closes.
I don't think Felix would be signed permanently considering Atletico Madrid ask too much money for his transfer fee. Maybe he would be loaned again. If he doesn't then I think Morata will be the leaving one. Maybe he would return to Italy if there is still interest from there.
Haven't seen a strong rumor about Alvaro Morata's departure recently but this could be really true how fast Saudi Arabian teams have been so far in the transfer market. They aren't holding much back with bids and are bidding kind of a lot over the players valuation in order to stop wasting any time with negotiations. Morata is almost 30 and is move wouldn't be much bad but from Atletico's point of view, they might decline such offers.
About Felix loan, I don't think it's a permanent fix. By loaning him every year, Atletico Madrid have to make a decision as they won't have much time later on as it will come near contract end. Felix is Atletico Madrid's biggest spend so Atletico will be actively looking for a permanent transfer soon.