Sorry I haven't made an announcement yet, I'm just waiting for Psy to show up and do his thing so that the website is 100% ready for when visitors arrive. I'm working on the announcement, though, so that I can post it as soon as possible.
Fenix, just like Python, is allowed. But you have to include all necessary files in the entry. You should also (but are not required to) submit a fenix/python-less version to us so that when we put them on the contest website come mid-december, people with the libraries already installed won't have to download them yet again.