Color content, format all great. The big 30% off is the most important thing on the email, it is waht your eye is drawn to and thats good because people love a coupon. I would only say ...perhaps, consider not being so wording about the new site. Instead of saying we improved optimization and (cant remember) say ... We created ou new site with you in mind. What do you think? This, because people dont care that you did this and that and the other, but they may care that you thought of them and want feedback...Also people are just lazy, busy and put off by spam, (not saying your spam) so we dont want to read about details....straight to the coupon, maybe skim a message about a new improved site and then perhaps they click through. Another thing you may consider is to put the Coupon on the new site say CHECK OUT OUR NEW SITE...and as a special thanks redeem a coupon on the front page for your next stay.
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