There was some discussion here: Rogers Updates 4.1 Handheld OS to 126.96.36.1990
I am not sure that we ever got a definitive answer as to whether the Rogers upgrade has the Zen theme. It is apparently in the Blackberry.alx file so it should install. However, no one has posted here that has actually installed it and confirmed that it is there (that I know of anyway).
I may be helping a friend with a new 8700r to upgrade tomorrow. If so, I will post the answer in this thread.