The discontinuation notices for this films have been out for a while. I was in Tokyo a month ago and stocked up on all this films. Neopan 400 (35mm), Fuji 160NS (120) and Provia 400X (120).
And yes, you could still buy some 160NS in 120 and 220. I have just checked Yodobashi website and every single store they have has it in stock. Same for 220 version, but it looks like the stock levels are a lot lower.
As for Pro 400, it's consumer version and it's cheaper than Pro 400H. As far as I know, it's Japan only. Here's a link to what it looks like: