Parece que vamos ter novidades em breve. Já tinha ouvisto o buzz, mas dei com a noticia quando visitei a página da W3C.
7 March 2007: XHTML2 Working Group created The XHTML2 Working Group was chartered today with the mission of fulfilling the promise of XML for applying XHTML to a wide variety of platforms with proper attention paid to internationalization, accessibility, device-independence, usability and document structuring. The group will provide an essential piece for supporting rich Web content that combines XHTML with other W3C work on areas such as math, scalable vector graphics, synchronized multimedia, and forms, in cooperation with other Working Groups.