http://events.nokia.com/mwc/
Nokia already informed some time ago that they would not be part of Mobile World Congress which is largest mobile phone event there is and usually been the place where manufacturers show their new high end toys including Nokia. It seems that Nokia will have it's own show top of the MWC in Barcelona where the MWC is held too.
We probally see more about Symbian Foundation devices than Maemo, but still a date where i'm sure we will get some new Maemo news too.