[Jack]

I think Kate becoming a "formal suspect" is just a formality more than anything. She would have been arrested if they had evidence on her.
I don't understand why Gerry McCann isn't a suspect as well but as he is being questioned later today, so it may well be announced. I personally don't believe the parents had anything to do with the abduction or murder but when the police have nothing eles to go by they need to explore all avenues. I'm actually surprised this didn't happen sooner. I feel for the McCanns at this time though.