Windows Mobile has not had the ability to handle OOXML-based documents until now.
This might make 2 applications which are built from the same codebase and properly support a derivate of OOXML. Both applications come from the same company, to whom OOXML is "a simple matter of (its) commercial interests", according to its own manager.
The biggest danger here is that when there's very little press or no "opposition media" left it becomes even easier to crush critics because there aren't many people left to speak about the matter