The xxxHolic-Tsubasa OAD website also got a layout change with a new splash image. There isn't any new news. The 4/1 update says that they accidentally announced wrong release dates on tv or something.
The dates are still the same...
May 15th: Tsubasa Shunraiki Part 2 with TRC Volume 27
June 23rd: xxxHolic Shunmuki Part 2 with xxxHolic Volume 15