Another german website also says, that the album will release in July (there is no accurate date):
http://musiktipps24.com/coldplay-die-brandneue-single-every-teardrop-is-a-waterfall-inkl-songtext-und-video/
But I dont't know if they just took the information from the radio station. Each way I belive that they are right. EinsLive is the biggest german radio station and normaly they are a very reliable source.
As arschpoeler sad, EinsLive even organized shows for Coldplay and Chris Martin has been on air.;) So I can imagine, that they have good connections to the managment or EMI music.;)
Edit: The website answered that they took the release month from the Einslive news...