With Oklahoma being in the central part of the US, and arguably at a major hub point in the nation's highway system, the state has a lot of possible future super highway corridors. It's another matter getting Interstate designations if they were ever built, although the "bait" of a future Interstate designation might get communities interested in economic growth opportunity more excited.
The problem is every one of the possible future Interstates in Oklahoma has obstacles. US-412 doesn't have a clear shot at being upgraded. With the possibility the very major "I-50" designation could be burnt on such a short, relatively minor route I'm not even sure I want it upgraded. The only thing more shameless would be some politician trying to call it "Interstate 1." The egos of many politicians know no limits. I really want to see I-45 extended up US-69 to Big Cabin, but we all know the obstacles blocking it in a couple of aging, tiny towns. I think Denver-OKC is a huge missing link in the national scope of the highway system, but it's not on the radar scopes of ODOT. Colorado seems to be doing as little as it can with its highways, never mind building a new super highway corridor. And now we have the NIMBYs and New Urbanist types raising hell about the Access Oklahoma plan.
What 3 digit designation is the Gilcrease Expressway going to get? If the OK-344 designation doesn't get used there I think it would alright to use that on the Kickapoo Turnpike if the Kickapoo Turnpike never gets extended South of I-40. If the Kickapoo Turnpike does end up extended down to Purcell then the OK-335 marker would be better.
I think I-640 would be fine for the East-West Connector, only if the Kilpatrick Turnpike is renamed I-240 and "I-640" starts at the Tri City Connector. Usually I-2XX and I-4XX designations are given to longer loop highways. I usually think of I-6XX routes as being connector routes like I-676 in Philadelphia, I-610 in New Orleans or I-670 in Columbus. There are full loop examples of I-6XX routes, but it seems like more of the full loop and half loop routes are I-2XX and I-4XX designations.