Relating back to what I said before, there's been a bit of speculation on Phantafriends.de about whether this investment will actually open this year, or whether it makes more logical sense to push it back until 2021.
Moving forwards, when the German government eventually allow the park to reopen (and Angela Merkel has recently said she will not be pinning a date on lifting lockdown restrictions as this could be a vital mistake, so the park will unlikely be opening 20. April) there are going to have to be severe restrictions in place. Potentially a cap on the number of visitors entering the park and therefore a pre-booking system required for tickets, poorly-ventilated areas shut and potential for guests to have to wear PPE whilst inside the park etc.
With the park potentially having to operate on limited capacity, it does not make sense to launch a brand new investment this year. Even if the park was able to operate at full capacity, visitor numbers will drop due to families having lost loved ones and others too scared to go into "social hubs". Therefore to launch an investment this year you aren't going to achieve back as positive or as high a return if you were to launch it in a normal operational year.
If everything is back to normal by September (UK government are predicting 6 months from now), maybe I could see them launching Rookburgh for wintertraum. However, in the current situation a summer opening seems somewhat illogical given advertising and marketing of a brand new investment will not have as significant effect as in a normal operational year. In summer time we could still be seeing borders closed and travel bans between countries, so even if leisure facilities are able to operate, there are going to be rules and restrictions for guests to adhere by.
The situation is changing rapidly everyday so it's too early to call it at the moment and they seem to be full steam ahead with construction, however it does seem somewhat illogical to launch a novelty attraction when you are essentially wasting the opportunity to heavily market and advertise that novelty and make a massive return off of it.
I may be completely wrong and I'm praying the world is back to normal by June, and then we could see a July/August launch for Rookburgh, but I think it's important to look at both the optimistic and pessimistic views of the current situation.