In what sense? The Jordan River is the border between Jordan and Israel.
is it true that its mostly Jewish Settled-Owned?
No. There are settlements in the valley, but the majority of it is sparsely populated and is not owned by settlers.
will that area be annexed by Israel?
I'm sorry but my crystal ball isn't working today. My guess would be no. Israel may maintain control of a piece for early warning stations but annexing the entire valley would mean encircling the Palestinians and making any future state less than viable.