Every year UEFA assembles a squad of technical advisers to analyse the Champions League tournament and the footballing trends that appear in it. This elite team then writes out their findings in the annual "Technical Report" at the end of the season, and 2010/11 has one as well. Truth be told, I was quite amazed by some of the tactical tendencies they have found this season.
These reports are very thorough and as UEFA puts it:
"This report provides a permanent record of the 2010/11 UEFA Champions League –
the 19th season of the competition. In addition to factual and statistical data, it
contains analysis, reflections and debating points which, it is hoped, will give technicians
food for thought and, by highlighting tendencies and trends at the peak of professional
football, also offer coaches who are active in the development levels of the game
information that may be helpful in terms of working on the qualities which will be
needed by the UEFA Champions League performers of the future."
I invite you to read the document as a whole, but I will enumerate and explain the five most important tactical trends pointed out in it and explain them in full in this slideshow, so you don't have to read it in full if you don't want to (but I seriously recommend you do).