iGoogle may be getting an updated interface
As for what's new, the rounded corners are gone, and controls are now only shown when you mouse over a gadget. Also, each gadget now gets its own little icon that can be seen to the left of its title.
The new interface is reportedly available only to a limited number of users right now, as is usually the case with Google's UI experiments. Whether or not this is going to get pushed to all iGoogle users at some point remains to be seen. It could undergo some further tweaking before that happens though, or it could be scrapped altogether. Only time will tell.