Actually, I will miss Rapture too, and yes, BioShck 1 & 2 are linked. I've played trough both a bunch of times and I loved them.
But I look actually forward to Infinite. I'm always open for new things so. The cameras and turrets are gone (thank god, actually xD) instead you have the Boys Of Silence. There is no more only being inside a city, crawling in tunnels and stuff, now they've opened up a whole new world - outside.
One thing I'm a little concerned about is that the little sisters and the big daddies are gone. I will miss that, but I still look forward to Infinite <img />