Mormon decides to forecast a little doom and gloom upon the non-believers. But first, he decides to kind of call God a slowpoke.
And now behold, I say unto you that when the Lord shall see fit, in his wisdom, that these sayings shall come unto the Gentiles according to his word, then ye may know that the covenant which the Father hath made with the children of Israel, concerning their restoration to the lands of their inheritance, is already beginning to be fulfilled.
So the coming forth of the Book of Mormon in the modern day should be considered evidence that God's master plan for the gathering of Israel is already well under way. But the Book of Mormon was published among the Gentiles in 1830. It's been one hundred eighty-seven years and there hasn't been much in the way of incontrovertible progress. That doesn't really speak to God's claim that he "will remember his covenant which he hath made unto his people of the house of Israel." I think maybe he forgot.
And then the rest of the chapter is vague threats against any and all who doubt the divinity, reality, power, or identity of God. And wo unto any who make problems for his chosen people. You know, the ones he's completely forgotten about.