They could very easily demo what ever they want to demo tomorrow in an extremely old build and not give away anything that may be coming in June. It's often easier to do it this way, if you have many changes, so that you make sure what you want to focus on works, without having to integrate it with any other new additions that it hasn't been fully tested with.
Not saying that what they are showing in June will or won't be huge, just that you can't say for certain that you are seeing everything that there is or ever will be after tomorrow.

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