|Alexander Rossi becomes the first|
American in F1 since 2007
It's not clear why Chilton has lost his seat or whether this is permanent or temporary, but either way it's a great opportunity for the 2008 Formula BMW World Champion. Chilton's management are saying that the Englishman stepped aside voluntarily to allow the team to re-sell his seat, however the team categorised the change as being the result of contractual issues.
Rossi has only recently joined the Marussia team as test driver, having previously filled the role for the Caterham team, for whom he drove in FP1 at the Canadian Grand Prix. The opportunity to drive the Marussia at a challenging circuit like Spa is something of a double edged sword - the long lap makes for a much longer acclimatisation and as a renowned driver's circuit will expose any unfamiliarity between driver and car viciously.
Still of Rossi takes this opportunity and makes a good fist of it it will do his reputation plenty of good. He has already been linked with both the Haas-US team (due to enter the sport next season) and a full race seat at Marussia in 2015. It may well be that a good performance at Spa earns him that Marussia seat for the rest of the season.
Either way things don't look good for the steady but pedestrian Chilton.