First off, you need to wait for the project announcement and the application period. But watch out, as it really does come up pretty early, and it goes by really fast, such as March or April. In general it helps to identify a project early in the application phase and try to write the best application you can. It is beneficial to discuss the project, your application and some trivial technical details on the board. For project specifics, it is better to engage in private e-mails with the potential mentor(s). Almost all successful candidates have represented themselves well on the board and also communicated the project details in depth with the project mentor(s). We had a good GSoC 2013, and I expect nothing less from GSoC 2014. So good luck next year.
Sincerely, Chris.
From: Sumol Lodha