Agree with John...no problem paying for updates, it is my decision if the update is worth the money.
Problem with Pixologic approach to announcing new versions is that it is very inconsistent. Apple never announces any dates or plans and people are cool with that. But announcing the date, than changing it to "indefinite" and leaving other dates in the air (BTW : is the original announced date for Z4 - in Q4 this year still valid ? I dunno) and missing much of them is definitely bad policy. Once they announced the release date, they should inform the community about the progress. Pretty bad PR in my eyes.