Yes, all QDeclarative* classes have been renamed to either QQuick* classes or QQml* classes. See this porting guide [qt-project.org] for a full list.
Qt Quick 1 was a new technology and has many limitations as you’ve found, so the Qt developers redesigned it to produce Qt Quick 2. Qt Quick 1 is now deprecated.
Qt Quick Controls brings QWidget-like components to QML (see http://blog.qt.digia.com/blog/2012/06/06/desktop-components-for-qt-5/ ) It will be released with Qt 5.1, which has its beta is scheduled to be ready in a few more weeks.
Unfortunately there’s no way to incorporate Qt Quick 2 components directly in the Forms window yet. If you want, you can use the bug report’s suggestions as a workaround: Create a custom QWidget which takes a QQuickView [blog.qt.digia.com] and then promote [qt-project.org] that widget in your Form.
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