It will be done over several phases and take 8+ years. The ramp from Southbound Broadway extension to westbound I-44 is scheduled to start in the next month. Those good areas to the north and south you spoke of were earlier phases of the same project. The whole interchange is complicated because of the presence of multiple utilities, the Deep Fork Creek and a tributary winding through the project site and the railroad. I'll look later and try and post the phases listed in ODOT's 8 year work plan here in this thread.
P.S. Merry Christmas OKC