All three Witcher games are getting limited retail re-editions, which are apparently exclusive for Poland, the homeland of The Witcher IP (known there as Wiedzmin). The first one, The Witcher: Enhanced Edition, is going to launch on September 22, 2017, and is already available for pre-orders in several Polish online stores (including CD Projektís CDP.pl), where it costs PLN 50.00 (or about $14).
Two others are going to follow soon afterwards: The Witcher 2: Assassins of Kings: Enhanced Edition on October 20 and The Witcher 3: Wild Hunt: Game of the Year Edition (including Hearts of Stone and Blood and Wine expansions) on November 17 probably with pre-orders happening a month earlier, just as it is the case now.
Each of the three games is packed in an exclusive Steelbook with elegant artwork, but for now there is no information whether these new editions will offer some other bonuses Ė the first one apparently does not. Still, it may be a fancy addition to the collection of some hardcore Witcher fans.