Maybe in the interim between writing the two columns it was decided they had to come up with a firm decision?
Thing is, no one at the BBC seems to be paying it any mind. (Even Red Bee Media who've produced the 3D trailer for the upcoming series are calling it Series 5.)
You know what, they might not actually give a damn what it's called and anyway, why should the BBC care? It' a massive organisation with a massive output.