The 959 seems to look much better. It was probably the worst looking Porsche in FM3 as it had polygonal bugs around the rear wheel arches inherited from the FM/FM2 days...
I think what gets me the most hyped for the Porsche pack is the sound. I can't wait to hear Nick's work on the famous flat 6 note or the amazing high pitched V10 note of the Carrera GT.
i do agree it looks better, the rear arches in forza 2 were terrible but this is just down to lower polys, the actual design of the car is still a bit off, pretty much every single forza 1 and 2 car is innacurate, cars introduced in 3 and 4 are next to perfect, the trouble is they dont update the old designs so you have models like the 458 which look perfect and the f40 which looks shit