Hi,
I was also accepted to the Dual Degree Program, and was searching for information about the tuition fee and scholarship. From what I've gathered, in the past it's been pretty substantial. On Quora, a current CMU-Madeira student posted his thoughts on the program, which I thought were helpful: http://www.quora.com/Carnegie-Mellon-University/What-is-it-like-to-attend-the-CMU-Madeira-program
It'd be nice to get another opinion though. I hope they decide to do a Twitter feed for those students who can't attend the open house.