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Hi there SwissAir,
I hope I can be of some assistance toward answering your question, and as I don't know the exact answer and haven't heard anything from Laminar Research or any official statements from them or likewise, I can only provide you with my estimate to the problem.
I would say Laminar Research are actively fixing and ironing out the truck loads of bugs that are pouring in from the Bug Reporting Page, and until they are satisfied with an amount of bugs and issues they've sorted will not release a Beta Update for X-Plane 11 or would prefer to fix all reported bugs and then move onto the bigger picture of full version release.
I hope I was some help to you.
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