Expect the Xbox E3 conference to be surprising

With E3 coming closer the excitement for new announcements is brewing. With many leaks and teases from almost every developer, companies and more throwing at us we expect big things, and that’s what we are going to get.
On twitter Phil Spencer responded to a tweet saying this:

This corresponds to another Xbox worker saying that an announcement will be bigger than Backwards Compatibility. That is a bold statement since Backwards Compatibility is probably the biggest feature on the Xbox One. All I can say is for sure is that don’t expect Xbox’s E3 to be disappointing.
What are your predictions for the Xbox E3 conference? what about E3 in general?