I've seen them in other stores than Media Markt, so I guess they're not exclusives. Of course I might be wrong here as the "exclusive" sometimes extends to Germany only, whereas it can be sold in other stores in neighboring german-speaking countries (Austria and Switzerland).
Hostel is a bare bones disc, there is no extra contents at all. Here's a link to the ofdb.de entry:
http://www.ofdb.de/view.php?page=fas...377&vid=373960
Hostel 2 is a bit more problematic. On Blu, only the R-rated cut has been released in Germany, further cut down by a few seconds in the throat-cutting scene around the 50 minute mark. Here's the entry on ofdb.de:
http://www.ofdb.de/view.php?page=fas...328&vid=374883
Compared to the unrated version, here's what is cut:
http://www.schnittberichte.com/schni...ht.php?ID=4588