Not specific to Ionic, but after upgrading Xcode from 6.x to 7.0 I'm unable to launch the iOS simulator with ionic emulate ios.
After some investigation, I found that typing ios-sim showdevicetypes shows the available simulator targets, like
iPhone-5, 9.0
iPhone-5s, 9.0
iPhone-6, 9.0
...However trying to start one of those targets, e.g. ios-sim start --devicetypeid "iPhone-6, 9.0" opens up a Finder window with the /Library/Caches/com.apple.dt.instruments folder selected instead of launching the simulator.
Anybody else having the same issue?