I love it, in fact i love anything involving britney
It fits the song, it's something new and cool. Although the reasoning behind it is more important. Since Britney is not in a good state right now, they couldn't take a risk and push her to do an entire new video. Nonetheless they have to promote the album, i think they made the right decision of giving her the rest.
that's why i love it, cus it's morally correct-ish ;p