There is no OS upgrade for the 568. Sorry.
As to upgrade or not, that's your call. I have a 568. It can do all the things you want to do. Since I don't have a newer device, I'm not sure what advantages a newer OS would have. Built-in wireless would be nice. Right now, I have to pull out my CF storage card to install my CF wifi card. Naturally, I can't install internet apps to that card because I won't be able to use them.
So, my suggestion...enjoy the 568 and save up for another one. They'll always promise bigger (or smaller) and better!
