HTC's main effort is andro, just like Samsung.
I think that Sammy are going to wait until Nokia gets WP up to speed (in terms of market share/traction) and then they will kick in. HTC... they are kind of in MS's pocket after they signed that patent deal to protect their android portfolio from the likes of Apple, so they will be around..
The 8X is a pretty good effort, it was specifically designed for WP, which is less true for the Samsung product. They just need a bit more flexibility in terms of hardware support.. Samsung shines with multi cores and big high res screens, Nokia shines with more.. practical innovations like camera, sound recording, etc. That has been the case for years.
I don't think people realize how important Nokia is for WP.. without them, think of what kind of market share they would have now, considering that Nokia will be another competitor running some random OS besides WP.