I had this problem this morning while I was on hold to book a placeholder (I wanted to get a feel for what rooms were available). What worked for me was clearing the cache/cookies, using an incognito/private browser, using a completely different browser that I don't normally use (eg using Safari on my laptop when I normally use Firefox or Chrome), logging out of my Disney account and then back in again.
I didn't do all of those at the same time -- it would work for a bit after doing one or two of those, but then when I would refresh the page and see the "Coming Soon" again. I found that logging out and then in again seemed the easiest fix. I was also on hold for two hours so I had a lot of time to play around with it! But it seems like it's a bug for everyone.