The 3 Series auto transport is perhaps the most important vehicle in BMW’s lineup, and though the automaker has given it a few minor tweaks for the 2011 model year (fascia nip/tuck, new N55 single-turbo mill), an all-new version is in the works for 2012. We’ve seen photos of the next-generation sedan all covered in BMW’s signature swirly paper, but our spies have just caught the wagon Touring version of the new 3er roaming around European streets, as well. Aside from the obvious addition of a more capacious boot, not much should differ between the 3 Series sedan and wagon when it hits showrooms, which figures to feature a range of new engines and a design more akin to that of the F10 5 Series and new Z4.

We’re sure that the new 3 Series Touring will fare well in European markets, but it’s unclear how the wagon will be received here in the States, especially since BMW is rumored to be working on a 3 Series Gran Turismo – similar to the 5 Series GT that launched earlier this year. However, the 5GT’s slow initial sales numbers may cause BMW to rethink its product planning, and the new 3 wagon will be perfectly poised to do battle with the likes of the Audi A4 Avant and Cadillac CTS Sport Wagon, as well as the new TSX Sport Wagon from Acura which will be arriving in early 2011.

No word yet on when we’ll see the production version of the next-generation 3 Series, though we certainly won’t rule out a possible debut at this year’s Paris Motor Show. For now, click through the gallery below to see the 3 Series Touring showing off its new rump.