Boudewijn: what does Krita need Qt4 for right now? is there nothing that couldn't be improved right now that doesn't need Qt4? imho, krita would survive just fine on linux/unix for another release or two and i don't see how image embedding or text printing affects krita.
the problem here seems to be the monolithic nature of koffice. sharing code between all those apps makes tons of sense; having an integrated office sweet makes just as much sense; but not allowing individual releases of apps where it makes sense seems pretty dense to me.
krita can't devel against koffice 1.x libs for another release or two while koffice2 libs come into being? i dunno, perhaps not. maybe krita is a good example of what ought to move to kde4/qt4 ASAFP.
i don't think it holds for for vast majority of apps, however.