According to the Welcome post last year for Face Tools, 

• Polygroup Support: Predefined ZBrush polygroups streamline the design process by allowing designers to concentrate on specific mesh sections during editing. Polygroups play a crucial role in preventing brush overspills, particularly when working on border regions of the lips, eyelids, eyelashes, and more.

However, when I send an head over to zBrush it comes as one Polygroup.It should have predefined ZBrush polygroups. Is anyone experiencing this as well?