Angular 2 is still barely out of beta and Google are already talking about Angular 3 with mention of new major versions every 6 months.

However, this doesn't mean you should start panicking and give up on Angular altogether!

Angular 2 was a complete re-write of the AngularJS framework many of us loved for years, whereas Angular 3 is a new version in the same way that AngularJS had 1.x releases frequently.

Todd Motto gives a great explanation of this in his blog: https://toddmotto.com/please-stop-worrying-about-angular-3