Hi Dario,
I don't know about any theme-zen problems, could you tell me where are does portlets hidden, the planner certainly changes the course home so you won't see the portlets as the usual course home.
That reference to theme-tupi is from the learning-content package but I haven't done that yet, I need to update the learning-content parts of the code to work with theme-zen.
About theme-tupi, there is no plan to commit that theme for now, besides I think this version of the planner might not work with theme-tupi since I changed it to work with theme-zen.
Hope this helps,