While googling for Syberia 3 references I came across a French blogger who thought there were hints about Syberia 3 on the Microids facebook page. Specifically, there was a reference to a visit from Benoit Sokal to work on "various projects" (Mar. 2); some artwork of mammoths that Sokal left after his visit (Mar. 5); and a comment about Kate Walker being in the foreground of some character art featuring Microid's female characters (Mar. 8).
Yeah, it's not much, but if Sokal is working on any game that would be good news to me (but assuming even that much seems iffy). It seems odd that they would be dropping hints rather than making an announcement of some kind. Treat this as vague, wishful thinking, but if you're interested you can check out the items mentioned for yourself on the Microids Facebook page, here.