Eirik Eng, President of Troll Tech (makers of Qt) has posted a lengthy response to a KDE mailing list.

Eirik answers many questions, including:

What are your intentions if Qt becomes the standard GUI toolkit
on Linux?

Would you raise a lawsuit against someone who completes a
toolkit using Qt’s API?

Isn’t there some way that you could release QT for Linux under a
license that we are more comfortable with and still make a

This and more at this