Based on the fact that these people have been working on material for ages, of course it's already out there in their circles of executives, friends, and countrymen.
But seriously, in that industry it's not hard AT ALL to obtain information and things of the like because everything is so heavily coordinated. "They" are banking on this new album to be a hit.. Planning for an 40th/30th/20th anniversary release, subsequent tour, maybe a book or something (not from Mick), or other grande surprises to follow will ensure that this goes over extremely well. So of course there will be people with insider information that may/may not be ready to share.