We've been told that the episode is "very powerful" and, according to star Darren Criss, will be "the beginning of a new chapter". But precious little else is known about what's going on in Glee's biggest instalment to date.
With the announcement of the Glee: Graduation album yesterday (April 17), we decided to have a go at predicting what's to come based on hints given by the tracklisting. Don't worry, there's no spoilers below, just speculation - so we could be completely wrong...
Queen: 'We Are The Champions'
Right, well, as some of you have pointed out already this does appear to be a huge spoiler that New Directions win Nationals. But it could also be intended as an anthem of empowerment to fit in nicely with the whole graduation lark.
We're going to go out on a limb and predict that 'We Are The Champions' does indeed refer to the Glee club doing good. Why? Because it comes pretty early on in the tracklisting. We know the songs might not necessarily be in order, but it would make sense given that Glee doesn't mind quickly dropping major plot points to progress the story.
Remember how quickly Quinn's fate was literally wheeled out in front us last episode? The finale is going to be all about graduation, so Nationals will need to be nipped in the bud pretty quickly. And singing 'We Are The Champions' while waving a trophy about should do the trick.
Bruce Springsteen: 'Glory Days'
This seems to have Finn all over it. Of the graduators, he's the one whose future is the most uncertain and we can definitely see him reflecting on his 'Glory Days' as he's pondering where to go, what to do and the rest of it.
If we're right, don't expect the finale to contain some magical twist where he's suddenly set for life - chances are there'll be a more downbeat and worn version of the character when season four picks up.
Room for Two: 'Roots Before Branches'
We're quite excited by the idea we've got in our head for this song. For those unfamiliar with the track, let's just take a gander at some of the lyrics - "I gotta have roots before branches to know who I am/Before I know who I wanna be/And faith to take chances to live like I see". Any guesses where we're going with this?
Basically we're thinking the ceremony would be the perfect time for Karofsky (Max Adler) to accept his sexuality and stand proud about who he is by singing a song like this one. It's a bit of an 'out there' suggestion, but maybe he could do it as a thank you to Kurt. And it would be nice for Karofsky's season three arc to close in a more optimistic way.
Green Day: 'Good Riddance (Time Of Your Life)'
Unsurprisingly, the tracklisting contains a number of graduation-appropriate songs about moving on, growing up, all that mush. And for all we know this could just be another one. But isn't "I hope you have the time of your life" the kind of thing you say to somebody when they're going on a big trip?
Perhaps it's sung to Rachel and Kurt as they head off to New York, but we've been promised that they'll still be a big part of season four. When we hear this song, all we can think of is distance - like this is intended as a grand farewell for somebody we might never see again. Have we been misled about how big an impact their graduation will have? Or is someone else going to exit?
Jason Mraz: 'I Wont Give Up'
Oh dear. It looks like someone's relationship might be at breaking point in the season finale if this song's anything to go by. Maybe there's a shock split coming - lovey dovey matters have been a key point in previous finales after all (Will and Emma's kiss, Rachel and Finn's multiple kisses).
Personally, we can quite clearly picture Matthew Morrison singing this, but Glee's given boys' songs to girls, girls' songs to boys and all kinds of things like that before, so it's not a concrete argument.
Perhaps this song refers to Rachel and Finn, given that her determination to make it big in New York has risked putting their relationship in jeopardy. Or maybe we've got it all wrong and it's Sam (Chord Overstreet) singing this about Mercedes (Amber Riley), saying how he won't give up on the idea of 'us'.
Beyoncé: 'I Was Here'/The Bravery: 'Not the End'
OK, these two songs have got us a little concerned because we've come up with some crazy theories after listening to them. See, 'Not The End' has some pretty morbid lyrics, like: "The memories in my head/Are just as real as the time we spent/You'll always be close to me my friend/This is not the end."
At a push it could be spun into being about friends parting, but we really get the suggestion of... well, death, from this song. Couple that with Beyoncé's track about making a mark on the world before you die, which some fans have already noted seems out of place, and we're getting a little concerned that someone may not live to see college. Or have we just got carried away...?
What do you think of the Glee graduation tracklist? What do you think will happen in the finale? Leave your comments below