First is pretty self explanatory: Just click newest and select oldest. Perfect for rating your oldest images for buzz
Second is also pretty straightforward. Just click the trophy icon in upper left and you now have a link to submissions instead of having to go to the article and scroll down to see it, saving several clicks (though I do wish I could submit already posted images like I can on the link in the article).
Maybe some other improvements released today, but these are the two I noticed.