Singer Adele released her second album, 21, in 2011 REUTERS/Mario Anzuoni

It has been more than two years since she last performed but Adele could be heading to the biggest stage of all to mark her anticipated comeback. The Rolling In The Deep singer is said to be a favourite to headline the Glastonbury festival in 2016, marking her return to the music industry. There are also reports that the Grammy-winner will discuss her new album in a documentary to be aired on the BBC.

Fans have been waiting to hear new music from the 27-year-old for four years since the release of her second studio album 21, which became a bestseller in 2011 after selling more than 30 million copies worldwide. With mounting reports of a third album, bookmakers Ladbrokes have slashed the odds of Adele making her long-awaited comeback at Glastonbury.

In a press release, a bookies representative said: "Adele's going to be rolling in the Glastonbury mud next year if this gamble is on the money. Punters have piled into her odds, and with tickets on sale in a couple of weeks festival organisers may have let a cat out of the bag." Also rumoured to headline the iconic music event are Coldplay and Foo Fighters, the latter of whom were forced to pull out in June after Dave Grohl broke his leg.

Despite the odds being in her favour, it seems fairly unlikely that the Someone Like You singer would choose a festival as large as Glastonbury considering she suffers from stage fright. Festival organiser Michael Eavis said in 2012: "[Adele] knows that we want her anyway but she doesn't want to do a thing our size. Going on the Pyramid Stage I think is a bit daunting in front of 80,000 people. It's a bit much, really."

Listen to Adele's single Someone Like You:

While the Glastonbury rumours remain shaky, an insider claims the Oscar-winning singer is set to discuss her new album in an hour-long BBC special. A source told The Sun: "Adele is simply too big just to be part of a green room of guests on a chat show. She deserves her own dedicated programme where the spotlight will only be on her. It's not like she desperately needs the publicity but you can't turn your nose up at that level of exposure."

As for when the album can be expected, Billboard reports that the Set Fire To The Rain hitmaker is currently in the studio recording tracks and is preparing to release the LP in November under record label XL Recordings.