Its great that the Xcode 7 beta supports iOS 6.0, iOS 6.1, iOS 7.0, iOS 7.1, iOS 8.1, iOS 8.2, iOS 8.3
But it deosn't support iOS 8.4, which is the latest release version.
And since I cannot migrate my devices backwards....
My Bad retracted
The Pre-Release section does NOT have a subsection for XCode and the XCode Betas, (despite the icon being an XCode beta icon) so....
The only place that I can Post this is here.
The current prerelease version of XCode 7 i.e. beta 2 still does not recognise devices running the current release of iOS, i.e. iOS 8.4
HOWEVER
if you download XCode 6.4 posted yesterday, then copy
Contents>Developer>Platforms>iPhoneOS.platform>DeviceSupport>8.4 (12H141)
to the XCode 7 beta, it seems to work fine.