Updates: Things are happening...at a glacial pace, but they are happening.
Construction has started on a bike/pedestrian bridge over US75/Central Expressway to connect the Northaven Trail to the White Rock Creek Trail.
Note: the SOPAC Trail extension is 'proposed', and for the foreseeable future it will remain ending in the liquor store parking lot on Greenville.
Fort Worth's Trinity Trail has pushed east to River Trails Park. However, two of the three times I've tried to ride out that far the low water bridge across the West Fork of the Trinity River @ Handley Ederville was under quite a bit of fast flowing water. Might need to pony up for an actual bridge, guys.
Plano has completed their Legacy Trail, making it possible to ride 32 miles solely on the path with no backtracking from 18th & Fireside in the east to Kings Manor & Brook Forest in the west. They lack only 500' across a muddy field to connect via path all the way to Allen's Stacy Ridge Park. And there's a new path that starts @ I & 12th Place and connects to Richardson west to UTD or south to Buckingham (although navigating City Line is a bit goofy).
In other news, the Plano mayorial candidate who was running on preventing the Hoblitzelle Trail to Russell Creek Greenbelt Trail connection (planned since 1985) from ever being constructed went down in flames (3.9% of the vote).
In 2001 McKinney, Frisco, Allen, Plano, Richardson and Garland won an award for their "Six Cities Trail Plan". The only actual link via path between any of these cities achieved in the 20 years since that I'm aware of is between Allen and McKinney @ Craig Ranch.
Connectivity. Glacial.