IBM Domino 9.0.1 FP4 IF2 is available NOW - Full support for El Capitan and iOS 9 ATS
IBM has released IF2 for IBM Domino FP4 IF2 right NOW which supports the latest ECDHE ciphers. And with that ATS (App Transport Security) on iOS and Mac OS X El Capitan.
Information about the IF2 => here.
The direct download list is available here.