Possibly final album 'A Head Full Of Dreams' will be released on December 4
Band are rumoured to be releasing new album 'A Head Full Of Dreams' in December
Band cryptically post the same geometric pattern seen on London Underground poster on their Twitter page
Album is expected to be called 'A Head Full Of Dreams'
Music's most famous farmer had previously claimed the event would be 'low key'
Adele, Blur, Foo Fighters and Muse also tipped for next year's event
Grande and Chris Martin played 'Just a Little Bit of Your Heart' together
Fan-filmed clips from New York briefly show Chris Martin and co's latest
Coldplay's record is thought to be called 'A Head Full Of Dreams', while Adele is expected to release '25' shortly
Band had donated a reported £10 million to the controversial charity