^ Yeah, they've been talking about doing that for a while now. I'm unsure that a controlled-access highway is the answer as a lot of that essentially parallels 183A. I do think that an E-W loop from Jarrell to north of Liberty Hill is inevitable someday, and it very well may run across a portion of Ronald Reagan before it turns south. The other issue I have with this is that it would have essentially two N-S toll roads for ten miles or so. Yes, the access roads would be free, but that's just silly to me in general. Better to just do an overpass in a couple spots (1431 and 29 come to mind).
All said, here is the Wilco
link for the Ronald Reagan corridor for those who geek out over such things (Okay, that's all of us...).
Other projects that happening (someday) in Wilco:
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2243 (aka Leander Rd at I-35) will be a controlled-access highway from Hero Way at 183A to SW Bypass in Georgetown, at which point it will continue along SW Bypass, and then Sam Houston, all the way to 130. This will be a great E-W connector across the northern metro.
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Wilco Highway - a partial loop around the western part of the Williamson County suburbs.