From Tamiya? Well if the SLR does eventuate then that'll probaly be it for new toolings till about 2008. So not really much point speculating when nothing is going to happen. Besides, Fujimi and Revell are pumping out enough good Ferraris and Lamborghinis to keep most exotic builders happy.
What I'd really love is for Hasegawa to do a top-notch 2006 Focus WRC.