There are strong rumours in Bilbao saying that the player could be negociating his comeback to Bilbao:
http://athletic.elcorreo.com/noticias/201505/17/operacion-llorente-20150516213733.html
(sorry; just the title, the info is for the paper edition only)
I think it's just his manager throwing the line to see what he can catch... but rumours are there anyways. Thre's some guy in an Athletic forum (and he's usually well informed) that says that those pieces of news are true.
We'll see
Besides, getting him to Bilbao could be troublesome as AFAIK most of the club members and fans (me inlcuded) opposed to his comeback. I don't see Llorente going anywhere: he's getting 4.8 milion euors per season after taxes; and he's comfortable making money and celebrating the titles the team is winning while he's warming the bench; so I don't think he's going to accept a pay cut. And I seeno one signing this guy for 9milion euros per season before taxes.