To display current version, we can use VERSION from @angular/core package.
import { Component, VERSION } from '@angular/core';
@Component({
  selector: 'my-app',
  template: `<h1>Hello {{name}}</h1>
  <h2>Current Version: {{ver}}</h2>
  `,
})
export class AppComponent  {
   name = 'Angular2'; 
   ver = VERSION.full;
}