LONDON, May 25 (Reuters) - Tens of thousands of Germans will descend on London's Wembley Stadium later on Saturday (1845 GMT) when four-times winners Bayern Munich take on domestic rivals Borussia Dortmund in the Champions League final. The world's most prestigious club soccer match pits unassuming 68-year-old Bayern coach Jupp Heynckes against excitable Dortmund boss Juergen Klopp, 45, in an intriguing clash of styles. ... More...