People, please don't read to much into this!!
First off, the novel is still a while away, so this could just be temp, or fake.
Second, in 2011 we a novel set in 2300 called Cast No Shadow. Spock was featured very prominently on the cover, but only had a tiny part in the actuall book. For all we know, Janeway's part will be in flashbacks, or a little supporting part.
Let's just wait and see what happens.