If you google "associated RC10B5 90003" there is a cached version of the TC6.2 manual where it lists on page 36 under 1/12th, 1/10th & RTR kits two models:
90001 RC10B5 Team Kit
90003 RC10B5M Factory Team Kit
I have no idea if this means a new car, a complete Centro kit or just a hoax/joke by associated/someone else but I do find the whole "when will there be a RC10B5 Midmotor kit" even more entertaining than watching skateboarding cats on youtube
. If you google RC10B5 people were talking about it back in 2009!!
Rob