Thanks for you feedback !
I think I'll pack my Velbon and some Delta 3200, along with some warm clothes.
Non-photography related : how do people manage shoeing for business purposes, with so much snow ? (aka "is it OK to have heavy shoes and the only ones, or should I bring some less "casual" ones ?)
I had a first look, and have a feeling that Kiasma is a place to go, would you confirm ?
(All other suggestions are welcome !)