Here is what TowersTimes has to say:
"Rumours of a Spinball Whizzer retheme for 2010 first surfaced several months ago, but now TowersTimes are able to confirm that these rumours are true.The ride has been rumoured to be renamed "Sonic Spinball", a reference to his 1993 game of the same name. A new colour scheme for the ride is already in the process of being applied.
The resort information packs in the Hotel bedrooms have been updated already, ahead of the new season, and a small promo shot of a Spinball Whizzer car has a Sonic the Hedgehog logo on the side. This would appear to confirm the plans for the ride which is due to open in February."
It is likely that the ride will open to coïncide with the release of Sonic and Sega All-Stars Racing, which has a release date of February/March.
Still no confirmation for when Sega will re-open SegaWorld - perhaps to coïnicide with the launch of the Dreamcast 2?
[Source: TowersTimes and forums]