I too like Pages '09 because of it's merge capability with contacts. This is the last straw for me. No more reliance on Apple software because they will someday decide to no longer support it. They always have. The new version of Pages does not support all that was great about Pages '09. McWrite Pro had more merge capabilities than either. I am moving to MS Office. I don't really like it, but it will always be there and older version features are always supported. Long term commitment to your customers is important. I have a long list of Apple applications I can no longer use. I guess I am a slow learner.
I used Pages for letters, quotations, packing lists, mailing labels, invoices, account statements, white papers, manuals, all sorts of professional documents. I liked it because it has great document layout capability and easily merges with my contacts. Pages is useless to me without the merge capability. This probably means that I may have to have multiple contact lists now.