That bolded line isn't exactly true.
What they told us was that the list in the Letter from the Producer showed their plans up until the end of the Summer. Now, look over the list
very carefully and note the wording. Anything that says, under the Current Tasks, 'Implementation, Additions, Changes, Introduction, Revisions, or Adjustments' we should get over the course of the Summer. Most likely also anything that doesn't have any Future Tasks associated with it.
However, anything that talks about 'Development, Examination, Planning, Devising, Design, Analysis, Finalization, Revision, or Establishment' bears no promise to be done during the Summer, because the implementation of those all falls under the Future Tasks category, and you may notice that 'Implementation', or one of the other prior words, is a key word for those items in the Future Tasks

.
So honestly, there isn't a 'massive' amount of content that they need to get out in the next few months.