Looks like this won't be an E Street album. If you look at the people who played on We Take Care of Our Own aside from violin and backing vocals it is Springsteen and the producer Ron Aniello.
Bruce Springsteen: vocals, guitars, banjo, piano, organ, drums, percussion & loops.
Ron Aniello: guitar, bass, keyboards, drums, loops.
Soozie Tyrell: violin & backing vocals
Patti Scialfa & Lisa Lowell: backing vocals
The New York String Section: strings