Regarding the "running cooler for Internet" part:
I have noticed that, before the update, whenever you launch chrome or firefox the graphics card switches to the discrete one, even if you are only on the about:blank page. After the update if you do not visit pages that ostensibly needs a lot of graphics power, the card remains on the integrated one.
In my opinion this is a big improvement in their algorithms for choosing which card to use, especially for those people who do not want to install gfxcardstatus: on my macbook pro the battery barely lasts four hours on the discrete card, but 8 hours, even 9 hours, is not a problem when on the integrated card.