This is obviously big news for the project. Step by step, thymeleaf is spreading through the Java (and esp. the Spring) world and it seems to be gaining good traction. SpringSource's Michael Isvy --very nice chap, btw-- has written a really useful introductory post :-)
For your information, besides this post, Rob Winch gave a great talk on "Modern View Technologies" two weeks ago at SpringOne2GX, including Thymeleaf --and also Mustache and Scalate--. All talks were recorded and SpringSource has promised to publish them once they are edited and ready. I will publish the link as soon as that happens!