Last night, I went to a public hearing on this project. The Draft EIS identifies Alternative 2 as the preferred alternative, although there are some slight modifications from the original concepts. Construction would take place over five stages spread out over about 20 (!!) years, with Phase 1 still being the Spaghetti Bowl Express project mentioned previously, which is anticipated to go to construction in 2020.
Alt 2 would install a DDI at Plumb Lane and remove the direct ramps to the airport along I-580. The airport has a compromise proposal that would keep the southbound ramp. NDOT is looking for comment on that as well. (I would prefer to see both ramps kept, and am not so sure on a roundabout proposed at the airport main entrance...)
Probably the biggest impact from a traffic operations perspective is that Alt 2 would eliminate the 4th/Prater and Rock Blvd interchanges and replace them with an interchange at Kietzke Lane (with frontage roads connecting Kietzke to Rock Blvd). It would also connect Nugget Ave to Rock Blvd (which would provide Rock some access to the Pyramid Way interchange as well.
Apparently, NDOT/consultants have used a new style or format for this document that is supposed to be easier for the public to read and comprehend–I haven't looked yet to confirm. Public comment period on the Draft EIS runs through January 15, 2019.
I don't think the revised concepts have been uploaded to the project website yet.