As a pedantic old fart, those words always irritated me. If this is Christmas - now - then a new year hasn't "just begun"
Far better if he'd have sung "And so this is early January..."
Or, maybe, "...a new one about to begin in a week or so."
Unless of course he was singing about the start of the old pagan year on the solstice, but then, he wouldn't be having much interest in Christmas, then, would he?
Anyway, nine days to go to submit to the FREE Write a poem about John Lennon competition. To be honest, in his later years, I always found him to be a bit of a wally, though, despite what TFE says, his catalogue of songs is quite incredible.
Not having much empathy for him as a person, it might be tricky for me to come up with something. Wonder if they'll accept a poem about the airport?