March 18-23: Would-be student participants discuss application ideas with mentoring organizations.
March 23: ~12 noon PDT / 19:00 UTC Student application period opens. [at Google]
April 3 Student application deadline
Mailing list and IRC:
You can ask more detailed questions about projects to our GSoC list: 
We're also on IRC: #pardus-devel in Freenode network. Just drop in and ask your questions.
Google's Summer of Code IRC channel ist #gsoc in Freenode.