In "How I met your mother" you can see Ted's wife in season 5 episode 1. 

So, they had casted her and knew who she was from season 5 (we are at season 10 atm), and Bruno Heller decided on RJ "a couple years ago"?

Nice. Epic job man. Thanks for all the disappointment and the waste of time. Maybe you should have asked the HIMYM writters for some tips. Jerk