Cross-Plattform Virus

You probably saw this already. There is the first proof of concept virus out there that seems to be able to cross the plattform boundaries and flip between Windows and Linux: https://www.viruslist.com/en/weblog?weblogid=183651915

I would be interestend in how you see this threat? Is it real? How big is the problem from your point of view? Do you expect an outbreak soon?

Roger