What will happen of QtScript
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As far as I remember the discussion, QtScript will stay in Qt5, so you will be able to use it just as today. But, and here you are right, QtScript is losing it's primary status, as internally, V8 will be used. There was a long debate on this on "Qt5-feedback":http://lists.qt.nokia.com/mailman/listinfo/qt5-feedback mailing list, you can read it there, as I don't remember the gory details.
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I found a "link":http://developer.qt.nokia.com/wiki/V8_Port here allaying most of my fears, concerns and heard rumors. Again respect for clear thinking ideas which are well communicated and documented. :)