technically, infiniti g35's are skylines...they're just not skyline gt-r's. there are prototype images for a new gt-r, but i don't know if it's gonna go into production. if they're gonna continue making gt-r's, rumors speculate that it will have the same chasis as the 350z but with a much more powerful engine (possibly a V6TT or a larger V8).
you can still get gt-r's though...
nizmo is selling some R34 GT-R Z-Tune for about $170k. it's extremely cheap considering that it's the fastest production car that's ever been tested...yes, even faster than the enzo or mclaren f1. but they're only making 20 of these bad boys.