Google's doing something rectangular'ish on Oct 4

Okay, you know you have to give it to Google for trying to keep things under wraps, and I like to play along and not make wild guesses, but... well, today they launched a new video on Youtube:

(aaah, the tones of Guardians of the Galaxy)

So, yeah, the search box we all know and love from Google morphs itself into a portraiture rectangle.

Hrmm... what could they be talking about?

Check the video description and it tells you to go to which redirects you to ... which is ...

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There's a link to add an event called "News by Google" with the description:

Join us for the Google announcement and be the first to hear the news.

So, keep your eyes peeled on October 4th ... something's about to happen.  I just wonder what?