Yes, the first acts have been announced for Latitude 2015. The poster above basically says everything you need to know about the festival's lineup (for now, anyway). The headliners over the July weekend over which it takes place have been named as Alt-J, Portishead and Noel Gallagher's High Flying Birds.

Returning to play for a third time, Alt-J are excited to jump back into the Suffolk festival as a headline act. "Playing there has always been so memorable," said the band. "Latitude has always supported us, and to go from playing the smaller stages to this means it will be a night of celebration."

The music programmer for this year, Natasha Hadded, said: "I'm ridiculously excited and honoured to be a part of curating Latitude's 10th edition line-up. Music, arts and emotions go hand-in-hand and we're so lucky to have an audience whose appetite for these covers such a broad spectrum; from the hands-in-the-air euphoria of Jon Hopkins, Caribou and Kiasmos to united sing-alongs during Noel Gallagher, Manic Street Preachers and Laura Marling, Latitude will also embrace the celestial moments of Portishead, James Blake and Sun Kil Moon."

The selection of music also takes in BBC Sound of 2015 winners Years & Years and Mercury Prize winners Young Fathers, as well as Django Django, Public Service Broadcasting, Wolf Alice, Unknown Mortal Orchestra and Toro Y Moi, all of whom (and more) are playing on the festival's BBC Radio 6 Music stage.

And as part of the 10th anniversary of Latitude, there'll be two new areas to explore – one of which is the Inbetweeners' Teen Area, "a hidden woodland wonderland" – and, for the first time ever, swimming in the lake will be allowed. Let's just hope the weather's ok for that.

Melvin Benn (Latitude's founder) said: "This year is the 10th Edition of the festival and we're celebrating with an event which, although it has evolved significantly from the intimate 4,000 attendees we started out with, I really feel has kept the special atmosphere and unique quality which sets it apart."

Latitude takes place at Henham Park, Southwold, Suffolk from 16th to 19th July.

For more information, and for tickets, head on over to the festival site.