In his feature story in the April 2014 Guitar Player, John Frusciante was pretty resolute about leaving behind the rock compositions of the Red Hot Chili Peppers in favor of solo experimentation, electronica, and rap. But it appears he hasn't entirely closed the door on big pop projects.
For example, via its website, the members of Duran Duran just announced the following:
"We were holding this exciting news because we were hoping to give you
full details when we announced, but as word has leaked out—catching us
rather off guard—we wanted to confirm: Yes, it’s true. the
extraordinarily talented John Frusciante has indeed been doing some work
from his home base in California on our new album. The tracks have been
going back and forth via the internet, and we are thrilled with the
results. We are all such big fans of John’s work, and are honored to
have him adding his magic to the record! There are no current plans for
John to tour with us, but his guitars sound incredible on the tracks. Hoping to have more news for you soon." — Simon, John, Nick, and Roger
Apparently, Frusciante held this news close to his chest for his GP feature, but he did confirm the news during an interview with Japanese Guitar magazine.
The upcoming Duran Duran album is the follow up to 2010's All You Need Is Now. Mark Ronson is again producing. From estimates provided the Duran Duran fan site, Duranasty, the new album is slated for a September 2014 release.
Hear Frusciante's "naked" guitar tracks on the Red Hot Chili Peppers' Stadium Arcadium album (2006).