Latest I've heard is driver isn't currently facing any charges at all - the spectators were at fault, sorry if that sounds harsh. My heart goes out to their families, but the driver wasnt at fault - rules are there for a reason (yeah, I know, we have too many rules in our lives already), but some are basic common sense - if a truck weighing over 2 tons, travelling in excess of 50mph takes off, the driver has no control - if you are over 100 ft from the track, your relatively safe, if your stood 5ft from the track (by your own decision), its your fault.
Just my 0.02c worth
Wurzel