Possible router bug/unexpected behavior

[tuurbo]

I'm submitting a ... (check one with "x")

[x] bug report
[ ] feature request
[ ] support request
https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior
HeroComponent is being recreated with each child navigation

Expected/desired behavior
HeroComponent shouldn't be recreated with each child navigation.

I was having the issue in my private app, so checked a plunker from angular.io and noticed the same issue there as well.

Reproduction of the problem
plunker was taken from the angular.io docs and just added console.logs and displayed the time
http://plnkr.co/edit/ey56dehV7rwfxkneK0oW?p=preview

Here is where i got the original plunker from angular.io https://angular.io/docs/ts/latest/guide/ngmodule.html#!#lazy-load

Please tell us about your environment:

• Angular version: 2.0.0-rc.5
• Browser: [Chrome 52]

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