If you have volunteered for the alpha, you can see the 5.0 alpha specific forums. The one thing we do ask you to do is provide feedback. Let us know your experience – good or bad… Let us know how things are going…
The alpha is not meant as a preview. We really want folks to get in there and try out themes and plugins. AND provide feedback to us.
We, of course, reserve the right to remove your access to the 5.0 alpha forums for lack of participation. That doesnt mean nonstop or immediately, but we do want to hear about your experience and see what you can create!
or do like we do… and edit the css file and make the fullwidth (single column no sidebar) actually use 100% of the available space…