I don't have the book (yet, not planning to get it) but one of my players asked this particular question.
From what i hear, Prototype Transhumanity Quality (and srsly...i suddently feel like about a bagazilion shadowrunners will now be designed from birth just to have access to it..) gives the EQUIVALENT of a pt of essence worth of cyber or bioware.
Soooo, does that mean, RAW, OR RAI, that mages can now cram 1pt of essence without magic loss? As this is NOT an extra point of essence per se.
Also, what happens when you remove those wares to replace them for better quality ones?