For me the highlight of the Photokina was the Leica exhibition in Hall 1. Very worthwhile to pay a visit there.
Also handling the A99ii is nice and already gives some information by chimping the shots and walking the menus.
There's also two counters in the Sony booth where you can test all kind of lenses (on your own body) or bodies (with your own lens) so you can take the pics home. Only not the A99ii
And you can't take them far, have to stay close to the counter for that, but I can see why they do that.
I'm already home in Belgium, so unfortunately no chance to meet. I just spent a good part of a day there (Wednesday 11:00 - 15:00) and for me that was more then enough.