Since TireRack is a title sponsor, I dug around to find the parts that will most likely be in the spec kit (maybe they'll bundle them all together):
Shocks and Springs looks like around $1000
SPC Camber Bolts $24
Eibach Sway Bars $515
TR Motorsport Wheels $676
Hankook RS4 (225/45/17) $533
SPC Adjustable Rear Lower Control Arms $313
All in looks like just over $3k ($3061), throw in a turndown style straight pipe catback and allignment+corner balance and you can set up the whole thing from scratch for $3500-$4000.