I'm very skeptical, and I recommend everybody to take this with an extreme grain of salt in order to avoid disappointment.
The property is huge and there is a big-a$$ old factory still standing on the property. Liseberg is also run by the city of Göteborg and the local politicians have not even decided on how Liseberg should grow on the new property yet. There's not even a zoning plan for the area yet, something that takes years to create, it can't really be that far yet. Also building big coasters in a city on a new property is very controversial in Sweden, so count on it being lot's of appeals when a new zoning plan is about to be voted into effect.
If we have a new coaster for 2018 then great, I will be the first one to get a boner. But I really don't see it as likely.