Actually the speed bump is considerably more then 10%.
The 10% improvement of Penryn is a clock-for-clock comparison. The T9300 is .3GHz faster than the T7500...so its much faster and cooler. Altogether it's worth the extra $100 that HP charges.
They don't have the specs on their site yet. Are you sure the LCD's are a full 1080p? Most laptops at this size only display 1680x1050 pixels max...just short of a full 1080p.
Let the hive mind of Engadget get that for you.
"I'm in the market for a new laptop, and I want a 13-incher. I need something with a great keyboard for typing, as this will mostly be used for note taking in class. I am absolutely smitten with the XPS 13, but I'm afraid that with its age Dell is going to give it an update soon. Any advice for someone in my shoes?"
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The price for the Penryn T9300 is around ~$350...and the Merom T7500 is ~$260.
So the $100 price delta isn't that far off.