We’ll, after saying nothing much since Siggraph (shortly after Pix announced they would deliver ZB 3.5 in Q4 2008 and this would finally unify the Mac and PC version.)   Today, not suprisingly, they finnaly made their next announcement.  

Hi,
The next ZBrush version is currently in development. Information about its release date will be made available 1st Qtr 09.
Thank you for your patience  
Happy ZBrushing! and Happy New Year!
__________________
So, no mention of the fix for displacement mapping, no acknowledgement of the absense of Zmapper, and no ETA for the eccentric behavior of Zbrush canvas (such as arbitrary scaling of the canvas to square form factors.)
It’s a sad thing that Pixologic, which has such a fine sculpting product, can’t do a little better at improving the issues with the Mac version nor provide any form of satisfactory communication as to when they might address the serious issues with the product.
Perhaps we’ll hear more in Mach . . . but given Pixologic’s difficulties with the calendar, I remain on the fence about recommending ZB to anyone who works with Macs.
-K