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Below is a quick video they posted to announce the changes. You will see that the changes are mostly cosmetic.
In their blog post, they also claim to have made algorithm changes that are supposed to improve the accuracy of your connection recommendations. I compared the before and after this evening and my recommendations are exactly the same. Granted, I am a bit more loose with the connections I accept and I probably have more connections than the average user, but with over 100 million users to choose from, I would think that an algorithm change would shuffle a few of the suggestions for me.
Anyways, here is the promo video. Is this enough to get you to go back and work on expanding your LinkedIn network? What other changes would you like to see LinkedIn make?