At this stage, everything is still tentative as the details start to coalesce.
Montréal, Québec, Canada. There are a number of venues. There are two possible non-academicc venues for having the hacking sessions, and Jordi is also investigating the possibility of having it in an academic setting, perhaps in one of the local universities.
Quick notes about Montréal: a lively city with English and French widely spoken plus many other minority languages. Most business can be conducted in either language. It has four large universities, two Anglophones, McGill, Concordia; and two Francophones: UQAM, and Université de Montréal. The Centre de Recherches Mathematiques (CRM) is a mathematical centre that brings together researchers from all four universiies and others.
The Montrealer summer can be quite hot and humid with some chance of rain.
June 4 - June 8, 2012. First two days are dedicated to Octave newbies, especially students, who may want help getting started with an Octave installation and possibly with a dev setup if they're interested in getting involved with development. June 6 - June 8 are dedicated to code sprints and development. Participants are encouraged to stay for all five days, but may choose to attend only one or the other depending on their interests.
There may be limited funding to cover the travel expenses of selected participants.