So, apparently the editing of the english script has been confirmed multiple places:
http://kotaku.com/gaming/censorship/no-pri...cher-320696.php
http://www.ttlg.com/forums/showthread.php?...7648&page=8
http://www.rpgcodex.net/phpBB/viewtopic.php?t=21134
http://www.thewitcher.com/forum/index.php?...mp;topic=3855.0
http://www.gamebanshee.com/forums/the-witc...s-93581-p2.html
Reading the excerpts, it's nothing meaningful that's been cut. However, in some cases it is the maturity of the dialogue that has been cut. A lot of flavoring dissapeared. And it appears to have been done because of agreements with Atari, not necessarilly censorship. My wager would be that it relates to voice acting costs.