Qt 4.2 introduces many new features as well as many improvements and
bugfixes over the 4.1.x series. For more details, see the online
documentation which is included in this distribution. The
documentation is also available at http://qt.nokia.com/doc/

The Qt version 4.2 series is binary compatible with the 4.1.x series.
Applications compiled for 4.0 or 4.1 will continue to run with 4.2.

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*                           General                                        *
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Qt 4.2 contains a lot of changes, which will be fully documented in the
final release.

For this tech preview, please concentrate on the new features and provide
feedback on the qt4-preview-feedback mailing list (see
http://qt.nokia.com/lists/ for details)