There's very little information at the moment, but I just saw this on RCDB:
http://rcdb.com/6712.htm
My guess is that it will be a Vekoma SLC, and that it will be the "Kumali" layout, probably with the extra helix, since Happy Valley originated that layout and has a few of them in their other parks.
Personally, I hope they go with something different though, as I hate that layout of SLC. Fingers crossed for a B&M, though I think that's unlikely. While some of their parks have some more unique coasters, Happy Valley really do like to clone their rides.
http://rcdb.com/6712.htm
My guess is that it will be a Vekoma SLC, and that it will be the "Kumali" layout, probably with the extra helix, since Happy Valley originated that layout and has a few of them in their other parks.
Personally, I hope they go with something different though, as I hate that layout of SLC. Fingers crossed for a B&M, though I think that's unlikely. While some of their parks have some more unique coasters, Happy Valley really do like to clone their rides.