I can't be happy because Capaldi and his awesomeness are leaving the show. And they'll probably replace him with another Matt Smith type. He'll be twelve years old and only communicate in catchphrases.
New showrunner + a lot of fan push for a woman Doctor = probably Ingrid Oliver.
I'm more concerned about Moffat's absence than anything. What was the best episode under Eccleston? What were the best episodes under Tennant? Who gave us Rory? Moffat's got his fingerprints all over the show's best moments.