Assuming it opens end of summer, there is no advantage on making the first half of the summer crowds not have that perk. Just annoys them. The issue is people are starting, or already think, Disney doesn't really care what makes park experiences more easier.
You would also think they would want this out ASAP, cause maybe more people would buy it, knowing they can do stuff in advance.
Then again, maybe they will offer one or two for free for resorts guests etc and that is taking longer to implement