When will the 4th 'Bring Me The Horizon' album be released?

I've heard from somewhere, I think wikipedia, that BMTH had started writing their 4th album. Has anybody heard about this? after their european tour i guess.

In December Machine head have planned to do a arena tour across europe with Bring Me the Horizon as the main support band as well as Devil Driver and Darkest Hour as supports. Oliver Sykes has stated that these will be the last European dates they'll do before they start the writing and the recording of their fourth album.