London - Adele previewed a new song on Sunday.
The 27-year-old singer - whose last release was 2012's Skyfall - surprised fans by teasing a new track during a commercial break for TV show The X Factor.
The advert contained just white text on a black background and Adele's voice could be heard singing the words.
She sang: "Hello, it's me. I was wondering if after all these years you'd like to meet to go over everything. They say that time's supposed to heal you, but I ain't done much healing."
No further information was given.
Adele's last album was the 2011 record 21.
Listen to it here:
Meanwhile, Adele reportedly turned down millions to record the Spectre theme song.
The Grammy Award-winning artist - who co-wrote and sang the title track for Skyfall in 2012 - didn't reprise her singing duties for the forthcoming James Bond movie because it would be too hard to beat her global smash.
A source said: "Adele was James Bond himself's first choice. Daniel Craig was really keen and (director) Sam Mendes was 50/50 over whether to use her or a fresh voice.
"Filmmakers were prepared to offer millions but Adele was never up for it.
"How do you top a worldwide hit like Skyfall any way? It was too big a risk."
The Rolling in the Deep hitmaker is currently focused on the launch of her much-anticipated third studio album and recently met up with One Direction's tunesmith Jamie Scott to get some advice.
A source added: "She has a mass of material but can't settle on what. She spent a day with 1D songwriter Jamie Scott but that probably won't see the light of day either."