As a fan of Borussia Dortmund (don't worry -- it predates their championship,) this will be . . . interesting. (Dortmund and Schalke are heated rivals -- it's the most significant derby in Germany.) As Dortmund can't make it, however (playing for the German Cup three days later - Schalke won last year), the U will have to thrash them in their place.
In all seriousness, it's good to see one of the better Bundesliga teams, a regular Champion's League participant, make it over here, and I hope there are more. It's an outstanding and very entertaining league. And I hope the Union humiliate them. ;) Will be interested to see what kind of roster they bring, as this will be right after the current BL season ends, as opposed to during the preseason, as with most of these friendlies.