Just noticed the Simulator for the devices that do not run arm64 (so iPhone4/5, iPad 2, which should be running i386 simulator) runs x86_64 in the simulator for release mode now in Xcode 6 by default.
To clarify: Debug mode still calls i386 for these simulator targets... so weird.
Noted in the build log:
clang++ -arch x86_64
Set Build Active Architecture Only to Yes