For a portrait or fashion photographer that is constantly shooting a variety of fabrics, an AA filter is a no brainer. For landscapes or most product photography I can very happily live without it.
And, if you use a program like Zero Noise(see discussion on this site for those who aren't familiar with it) and bracket the shot, the effects of not having an AA filter pretty much become a non-issue. Win-win for outdoor photography types. Indoor and wedding photographers... probably want an AA filter and them some.
Of course, if the makers were smart, they would offer two models - one with and one without for a small up-charge.