One oddity: The widgets aren't yet labeled properly as to which are for phones and which are for tablets, and if you try to use the wrong set, they won't work right. I'm guessing they'll fix this pretty fast, but for now, the ones labeled "HD Widgets (5)" are for phones and the ones labeled "HD Widgets (6)" are for tablets.
(Update: If you open the actual app once after installing or upgrading, the wrong set of widgets will disappear. The developers are actively working on a better fix.)
Let the games begin!