Thank you, will still keep fingers crossed. (By the way, what is EVG, it is another union?)I just got back from Köln yesterday.
International trains to Brussels, both Thalys and ICE seemed to be running as normal and there seemed to be an hourly ICE to Berlin so you should be OK whatever happens (always assuming EVG don't get in on the act too!).
I was surprised by how quiet the Hbf was yesterday morning. I'd expected long queues for information, busy platforms and packed trains but everything was very quiet. It seems that people have got used to the situation and made other arrangements.
The Autobahn and other roads seemed busy though!