I realized I didn't post my proposal to the list yet (I have added it to
the official GSoC site few days ago), so here it is:
In short, the project aims to create new format for dumps (which allow
users to download parts of the database of Wikimedia projects). The primary
advantage of this new format will be that it should take shorter time to
create the dump, because the previous dump can be reused.
Any comments or co-mentors (as far as I know, Ariel Glenn is currently the
only potential mentor on this project) are welcome.