The introduction of the FT86 will see a renewed interest in the older ae86 initially... Like any famous persons death, memoriabilia jumps whilst the part time fans get on it, but after a while the prices drop back to normal. I see the same with the ae86.
Check out peter brock stuff on ebay, things with his signature is worth no more than things without and probably 1/10th of what they were going for weeks after his death.