Now, I'm not just plucking a 2020 coaster for Thorpe off the top of my head here, because in July 2017, members of TTSP Forum were introduced to Project 2020 at a talk during one of their events. They were given this image to go off of (Credit to TTSP):
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Now for those of you that don't know, this is an image of the Meydan Bridge in Dubai, and apparently symbolises "the road to 2020". However, my take on it is that they could have chosen any old road and put that on it if they wanted to symbolise the road to 2020, and that they chose the Meydan Bridge for a reason. And that reason, in my opinion, is because the Meydan Bridge resembles airtime hills by design. Which would imply that the park is looking into some sort of airtime-focused coaster for 2020.
The team who led the talk also apparently said that they want an attraction with 3 key things that Derren Brown's Ghost Train (Thorpe's last major investment) lacked; high reliability, high throughput and the ability to market itself.