Taken from Motomatters (2012 World Superbike Provisional Rider List | MotoMatters.com | Kropotkin Thinks):

Provisional rider entry list for the 2012 World Superbike series:
No. Rider Bike Team
1 Carlos Checa Ducati 1198R Ducati Althea
2 Leon Camier Suzuki GSX-R 1000 Crescent Suzuki
3 Max Biaggi Aprilia RSV4R Aprilia Corse
4 Hiroshi Aoyama Honda CBR1000RR Ten Kate Honda
8 Mark Aitchison BMW S1000RR Team Grillini
17 Joan Lascorz Kawasaki ZX-10R Provec Kawasaki
21 John Hopkins Suzuki GSX-R 1000 Crescent Suzuki
33 Marco Melandri BMW S1000RR BMW Motorrad
34 Davide Giugliano Ducati 1198R Ducati Althea
36 Leandro Mercado Kawasaki ZX-10R Pedercini Kawasaki
44 David Salom Kawasaki ZX-10R Pedercini Kawasaki
50 Sylvain Guintoli Ducati 1198R Effenbert Liberty
58 Eugene Laverty Aprilia RSV4R Aprilia Corse
59 Niccolo Canepa Ducati 1198R Ducati Roma
65 Johnny Rea Honda CBR1000RR Ten Kate Honda
66 Tom Sykes Kawasaki ZX-10R Provec Kawasaki
84 Michel Fabrizio BMW S1000RR BMW Italia
86 Ayrton Badovini BMW S1000RR BMW Italia
87 Lorenzo Zanetti Ducati 1198R Pata
91 Leon Haslam BMW S1000RR BMW Motorrad
96 Jakub Smrz Ducati 1198R Effenbert Liberty
121 Maxime Berger Ducati 1198R Effenbert Liberty
? Chaz Davies Aprilia RSV4R ParkinGO