Warner Bros. Motion Picture Imaging have been involved with a large number of recent restoration projects, including Blade Runner, The Godfather Trilogy, How The West Was Won, The Red Shoes, A Star Is Born, Doctor Zhivago, to name but a few. Audiowise I don't know, but I imagine they'd do the same as for picture. They probably have a lot of stuff on the go, so they may not have gotten around to your favourite film yet. I'll be happy with seeing Barry Lyndon on Blu-ray at last.
Disclaimer: I don't work for WB MPI, but I do work for one of their suppliers.