The PlayStation 4 got a significant boost in February thanks to the console's launch in its home country of Japan on the 22nd. In its press release today, Sony noted that approximately 370,000 consoles were sold in Japan between its launch and March 2.
That compares incredibly well to the roughly 330,000 units that were sold in all other global markets between February 8 and March 2, but until we know how Sony's doing on the supply side, we don't know how that reflects on demand for the console in Japan.
In the United States, it can be incredibly difficult to get ahold of a PlayStation 4 due to limited supply — it's simply sold out everywhere. We won't know until a few months from now whether the same is true in Japan, but it wouldn't be a shock to see a drop in sales in coming months, as Japan as significantly shifted towards mobile gaming in recent years.