A Polish site called The Witcher's Biggest Unofficial Site has spoken with folks from CD Projekt Red during the Poznań Game Arena show (no English webpage, so no link) about The Witcher. Summary:

• The 1.2 patch should be released somewhere around December the 7th
• The demo should appear somewhere around December the 13th
• The editor (called "Djinni") should be relased "somewhere around those dates"
• The series will be continued, but it's not decided whether what comes next will be an expansion or a sequel.

Thanks, Mayday!