Judging from whole history of Qt I think qole is right - those are just temporary hacks to push round Qt4.6 block through square Hildon hole.
If they wanted to make it permanent names would be more like QMaemoKineticScroller etc.
Note also it is "Technical Preview" version of 4.6 for Maemo - not super-final-stable version. They may vanish as soon as official build of 4.6 will be released. Or more probably will be properly integrated into main sources with 4.6.1 release or something similar.