The roles at Williams , Red Bull , and Squadra Toro Rosso remain open .
GP2 race winner Neel Jani is expected to fill the seat at one or other Red Bull team following his inclusion in the five - man driving line - up revealed in China .
The roles at Williams , Red Bull , and Squadra Toro Rosso remain open , although GP2 race winner Neel Jani is expected to fill the seat at one or other Red Bull team following his inclusion in the five - man driving line - up revealed in China .