Yesterday at FOSDEM (Free and Open source Software Developers' European Meeting) Marko Mattila had a presentation about QML application development with a showcase on Jolla's Sailfish OS.
In the course of the presentation it was communicated that the SDK Alpha version for Sailfish OS will be available by end of this month.
It is very probable that further information and presentations about Sailfish SDK will be given at MWC 2013 in Barcelona from February 25-28 where Marc Dillon, CEO of Jolla, will give a keynote. Part of the Jolla team will also be present in Hall 2, Stand 2MR82 / 2MR84 to answer questions and demonstrate their product.
More:
Sailfishos.org Wiki
Jolla to attend MWC 2013
FAQ about Jolla and Sailfish OS
Source: fosdem.org via jollafr.org, cardbox by graphicsfuel.com