Either Google is revealing it's new social network, one tweak at a time, or something else is going on. Either way, after I updated my CR-48 today with the new Chrome OS, I had this new little tweak on my Google home page.
UPDATE #1 - it's definitely NOT just on my google home page... it seems to follow me all around, to all sites within the google ecosystem.
Update #2 - there is also new GMAIL Mail settings under a gear icon.
Update #3 - the new +1 tweak does not show up in google docs
Cool stuff, I can wait to see what they build into their new social platform.