Checked that Arkansas site on BVB and nothing really new that we didn't already know. Still leaving us guessing on what building will or won't occur.
According to the District Engineer, the "Hiwasse Bypass" will be first (basically starting & ending at AR 72), built as a Super 2. Next will (maybe) be from Hiwasse to the MO State Line, either grading & structures or just grading.
As far as I-40 to Texarkana, there is already work underway near Ft Chaffee in Barling. The biggest hang-up seems to be crossing the Arkansas River: there's no money for it.
South of the Ft Smith area, I've heard nothing about plans for I-49.