We don't have much of anything to speculate on right now, so please forgive me.
These are anticipated dates based on the pattern of the past two years, so please understand that what I'm about to say isn't concrete. If you've been a scare-actor before, then expect to receive an email announcing the reunion audition sometime between Thursday, June 16th and Friday, June 17th. Expect the audition to be at 6PM on Tuesday, July 5th or possibly Tuesday, July 12th due to the closeness of the 4th of July holiday. Get there early, like add an additional hour on to whatever time you're plan on arriving. If you currently work somewhere else in the parks, then make sure that you have your temporary transfer papers signed by your direct supervisor or the head supervisor/manager of your home department. Last year, after immediately being seen by the judges we were told that transfers weren't being accepted at that time. I think that may have just been due to the 20th Anniversary and the fact that seasonal entertainment employees were coming out of the wood work to be a part of it. Typically, transfers are welcomed without issue, provided that the person has used the appropriate chain of command to get permission. But, just in case, anticipate that you may be asked to return that Saturday for the internal makeup audition or the following Tuesday for the first opened casting call. If you're new, then come to that first casting call I just mentioned and, again, get there early. The sooner you audition, the greater your chances are of getting chosen.
Back on track. I don't think Universal has specified enough for us to know if the old shows have been scrapped. Like, Bill and Ted will probably be back in full force because that show's construction is constantly evolving with the times and not HHN, but I'd guess that the rest are up for revamp, replacement, or re-imagining. I don't think they will re-imagine or even slightly revamp Beetlejuice or Rocky Horror, even though I personally think that both are deserving of it, and Bill and Ted will probably get some kind of new technical attention. I could really see Universal turning it into a permanent 3-D show, as was rumored last year, at least that's a believable venture to me. I honestly wouldn't mind a Shock Treatment/Rocky Horror mashup, but I'm in the minority.
... Now, that's a brilliant idea. Back off track. lol