To follow on from my previous post on this, here is another good article on the Corel decision to support the Office 12 format, OpenXML and PDF (like we will) but not ODF.
Paraphrasing from the article..

Greg Wood, communications manager for Corel WordPerfect, says it comes down to customer demand.

"Our involvement with OASIS and ODF continues. While Corel does not disclose details around our plans for future versions of WordPerfect Office, ultimately inclusion of ODF in WordPerfect Office will be based on customer demand for this format. At this time we are not seeing an expressed demand for ODF from WordPerfect Office customers, but we will continue to evaluate demand for ODF closely," said Wood.