The event will take place in New York and should be host to the Pixel 4 and Pixel 4 XL, for sure. Other devices expected are a Nest Home Mini and possible Pixelbook 2. There could be other surprises in store, though none are coming to mind at the moment.
Google will host a livestream of the event at 10AM Pacific Eastern (1PM Eastern) on the 15th and October 15, 7:30 PM for India viewers, so you can watch along as we work our way in the doors to get our hands on whatever they do announce.