New series of Nikon digital SLR

I've been keeping an eye on Nikon digital SLR's price information recently. It seems almost all stores are cutting its price. According to Kakaku.com,

D80 : \67,988.
D200 : \107,860.
D300 : \161,460.

I heard Nikon would unveil its new series sometime soon. The new series would be better and cheaper than current series. I mainly want to take pictures of racing-car. Now, therefore D200 and D300's high-speed continuous shooting are enticing me. Or, should I be waiting for new series? What do you think?