As of July 6, 2015 ‘nebular-readjustment’ is the current stable version of AngularJS. We want to share code between our Ionic and desktop apps. The 1.0.1 ‘Vanadium Vaquita’ Iionic.bundle.js references Angular 1.3.13 which raises concern about adoption of 1.4 features (primarily related to forms). …

Angular 1.4.2 current stable

hermansje July 21, 2015, 5:08pm 2

This is discussed in this post.
Support for AngularJS 1.4 is planned for Ionic 1.1 (no ETA yet).

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Angular 1.4 and ionic ionic-v1	14	7667	August 21, 2015
AngularJS is Ionic	3	1194	October 7, 2015
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