Test Drive - I doubt they will exist.
I purchased a WRX at the height of their popularity in '99 and the dealer had no stock for test drives as they were all pre-sold. The only option they gave me was that when the one I ordered came in (in 3 months) I could take it for a test spin and if I didn't want it then I could walk away.
I am seriously considering purchasing an R35 but Nissan are likely to be wanting $5k+ in Oct and then to not deliver until 2010+ stinks, mid 2009 I could live with.