serebit No blog post doesn't mean Solus is dead, it just mean there are no major news to share.
The roadmap is not meant to be updated... It's just a road map to give targets to the responsible and some transparency to the users.
News are posted on the blog only when there are important news to share with any users. In addition to the important news, there are also some announcements made on this forum. And people who are interested in the day to day (technical) life of Solus, can have a look at the dev tracker / IRC channels.