Eduardo,
The list you found on the Tcl wiki is only a starting point, feel free to add ideas!
The full timeline for this year's GSoC can be found at http://socghop.appspot.com/document/show/gsoc_program/google/gsoc2010/timeline
But in a nutshell:
Student applications: 29 March until 9 April
Accepted students announced: 26 April
Students code: 24 May until 9 August
From 26 April until 24 May, students get to know their community.
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If you want to be a mentor or a student; or if you think you might want to be a mentor or a student; or if you're curious; or if you have a great idea that somebody else should work on :), please join the Tcl-GSoC mailing list mentioned above, and start chatting!
Matt