I've broached the topic of kneeling to receive Holy Communion two times on this blog. Although those of us who have maintained the traditional practice of the Roman Rite have been labelled, even by certain orthodox Catholics, as "disobedient", the fact remains that kneeling for Holy Communion has always been the norm in the Roman Rite and it has never been forbidden for any Latin Rite Catholic to kneel to receive our Lord in the Eucharist.
A friend sent me a link to this video of the question being posed to Cardinal Arinze. This is a refreshingly unambiguous response. Can't get any more clear than that.