No. About a year ago or so, the mangaka was recorded saying the story in his head was only half done.
As I mentioned, yes. The second link is about just that. Still, it's not totally impossible he changed his mind, but as I said; I HIGHLY doubt it. It's either the final chapter of an arc, or just a marketing thing. Writing "final chapter" on your book (or in reference to, rather) does imply an ending to something. We'll just have to see what he means by it.
*edit* Well, the final chapter could still mean it goes on for years of course. It's not like it says the upcoming issue is the final one.