Thanks for the clarification, Rok. Now I see your point.
We don't offer project.json file as part of the UI for ASP.NET MVC 6 Beta distribution. The reason for that is the vNext Beta versions constantly introduce breaking changes with each subsequent update, and we constantly need to update our Beta to keep pace. We do that for "official" vNext Betas, but we cannot do it for nightly vNext builds.
Therefore, even if we include project.json file, if our Beta produce doesn't work against the latest vNext nightly build (due to namespace changes or other breaking changes, which happens very often so far), you won't be able to use it.
I hope you understand our position. I'll forward your feedback to be taken into account by our devteam for the future RC and RTM vNext release, when we could consider adding project.json file to the distribution.
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