You can see, but not touch the Xbox One at your local Microsoft Store
PAX Prime may be one of the last major events for consumers to get a look at next-gen consoles, but Microsoft is doing those unable to attend a real solid. If you can find a local Microsoft store, you'll be able to see the Xbox One up close.
Unfortunately, Microsoft will be hiding the Xbox One behind glass, meaning you won't be able to get your grubby little hands on the improved controller or smudge the Kinect's camera lens, but at least you'll be able to see the console up close and imagine how it will look on your shelf at home.
Speaking of shelf, don't ever put your console on the floor -- just yesterday I found a massive spider living under my PS3. It was terrifying.