From reading about the Kingwood Mobility Plans (linked below), I think the eventual plan is to extend WLH all the way to Grand Parkway. Currently, plans are already underway for an extension of Woodland Hills to Ford road.  
ersonally, I love both of these expansions.Also, FWIW, there are plans to widen Mills Branch to 4 lanes. Construction planned for a 2019 start date. Below are the overall plans and some maps.Overall Kingwood Mobility Planshttps://www.kingwood.com/mobile/view_message.php?parent_message_id=1225720&fb=1Some maps are linked in the story, but I'll add it here, too (last map on last page shows the Northpark/Mills Branch improvements):http://gundacorp.com/wp-content/uploads/2014/05/Kingwood-Area-Intersection-Improvements_A1.pdfEdit: Punctuation. 4951