Looks like the game now keeps track of how many Birdies, Eagles, etc. you have accumulated. After getting an Eagle today it showed "361 Eagles" in the top right corner. Pretty neat little addition.
I'd say there is a slight upgrade to the graphics but a major upgrade to the lighting. During certain times of day the game looks completely different it's quite amazing.
I think I heard the game is 50% off on the PSN Store and $10 at Redbox too. Great price for the game. If you enjoyed the other Hot Shots games you'll like this one too, the only drawback is that it only uses the 3-Click Swing type and there's no option to use the others.