Filming for Glee season 5 is well under way, and fans staking out a filming location yesterday were able to confirm some online rumors regarding song spoilers and surprise returns.

Glee spent yesterday filming at the Cravens Estate in Pasadena – better known to fans as Dalton Academy – filming scenes involving both the Warblers (including Grant Gustin’s Sebastian Smythe) and members of New Directions.

Fans present at the filming location confirmed that, along with Grant Gustin and many Warbler extras, the New Directions cast including Darren Criss, Chord Overstreet, Blake Jenner, Jacob Artist, Melissa Benoist, Jenna Ushkowitz and Kevin McHale were on set. Also present, interestingly, were Chris Colfer and Mike O’Malley.

The shooting of a musical number – “All You Need Is Love,” featuring Warblers alongside Darren Criss as Blaine, was confirmed. Pictures and reports from the set show Mike O’Malley as Burt Hummel bringing a confused Kurt to the location, so could this incident finally be the long-awaited (…for some) Klaine proposal?

“All You Need Is Love” was one of several musical numbers recently revealed by Glee site GleekOutBR for the show’s upcoming Beatles tribute. GleekOutBR is a rumor site that has, to date, not revealed its sources, but is believed to be part of a grass-roots marketing tactic and is given information as a “controlled leak,” as their song spoiler posts have had a near 100% accuracy rate.

So far, the site has claimed that season 5, episode 1 will include “You’ve Got To Hide Your Love Away” featuring Kitty and Artie, “Yesterday,” sung by Rachel, “Got to Get You into My Life,” by Kurt and Blaine, and the now-confirmed “All You Need Is Love,” claimed to be performed by Blaine with not only New Directions and the Warblers, but also Vocal Adrenaline and the Haverbrook Deaf Choir as well. Fans on set spied the two other glee clubs present at the Dalton filming location, so it seems that GleekOutBR was once again spot-on with their spoiler information.

The Glee cast have also begun to reveal the Warblers’ return, with Kevin McHale posting this picture of himself and Grant Gustin together in costume:

How do you feel about the return of Sebastian and the Warblers, and the four glee clubs gathering together at Dalton Academy?

Glee season 5 premieres Thursday, September 26 on Fox.

Header photo credit to Ana Rivas.