Hello Valentin & welcome :-)
You know that we are in the same case ! :-) I'am also a french student in 4th degree of Computer Science. I am studying in Grenoble at "Ufr Imag - Université jospeh Fourier". I -join- the Inkscape community about one month & I am currently writting specs on the Inkscape Wiki.
I was also thinking about participate to GSoC 2010, but someone tell me that the GSoC is a full time work between may and july. But my studies will not be finished at this time. That's what I gave up participating in GSoC.
Anyway, I can just advice you some links :
- http://wiki.inkscape.org/wiki/index.php/Google_Summer_Of_Code - some ideas for GSoC - https://blueprints.launchpad.net/inkscape - others ideas - http://www.w3.org/Graphics/SVG/ - SVG specs : some things to implements on Inkscape
Have a nice work on Inkscape !
Albin Manoël