A few enterprising individuals found some unlisted images on the Oculus website, and it looks like they may provide some hints about what we'll see at the event on June 11.
The company was quick to pour water on the fire.
"This is an old placeholder concept image that we accidentally leaked. Everything in it is ancient, certainly nowhere close to final (as evidenced by the GPU specs and the game named "war")," Oculus' Palmer Luckey stated on Reddit. "Enjoy checking it out, at this point, but don't expect everything to carry through to the stream on the 11th."
The images are shown below, and you can click on the picture to see them in full resolution. The images were pulled down nearly immediately after they began attracting attention. It's also worth noting that the wand-like controller shown is sporting the Oculus logo that was only today revealed to the public. These may very well be older renders, but they may be able to show us what the final product will look like, or at least provide us with some guidance.