While we wish we could fit all our ideas into one campaign, in order to ensure we could deliver something within a reasonable time frame, we had to make decisions about what we could and could not do. That being said, we are nowhere near done. :)
PLEASE do continue to discuss ideas on how to better support GM’s and the DnD community!
Long answer: We are developing all the content within the guidelines set in the Open Gaming License, Version 1.0a, under the terms and conditions set forth in the System Reference Document 5.1 as provided by Wizards of the Coast.
You can review it here: http://media.wizards.com/2016/downloads/DND/SRD-OGL_V5.1.pdf