Nothing specific. Few months ago Bagiński said that if everything goes according to plan they will announce cast in the spring, and start shooting this year so movie could premiere in 2017. Technically, summer begins 21 June, so who knows...
Speaking about Mikkelsen - it's unlikely (he's 50 now, and if this movie will be successful, they want to create a whole serie.. Here's excerpt from polish interview with Bagiński:
"Is there a chance to cast class actors like Michael Fassbender?
- Financially it achievable, for the actors - interesting because we have conceived and well-written character of Geralt, but also Renfli or Stregobor. Every agent in town will read a script from our producers.. The problem is the age: most of the actors, which we think are people in their fifties and our witcher must be very physically fit."
If you interesed, here you have a different interview with Bagiński with English subtitles, where he speaks about Witcher movie