They will still be all-season tires for the 3.0. The sport package mainly adds electronic damping control (suspension), the sport seats, and bigger wheels (which do just as fine in the snow). The rest as you may know is aesthetics.

Only the 4.8 with sport pkg & upgraded 20" tires will yield the summer tires you're probably thinking about.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr