While Goodland (and Salina) never showed up on the Supercharger map in the web, they did appear on the status board in ?Hawthorne? as Coming Soon for a few days.
There wasn't any sign of Tesla's Supercharger hardware at the site on Friday or Wednesday (May 9 and May 14) when I drove by. The only reason I found the site was the detailed pictures back in post #6 in this thread. The picture below is of the Supercharger site as of May 14 and is taken from the "probable equipment area" in Cottonwood's post. This photo was taken on the North side of the Holiday Inn and looking towards the East. You can see the conduit sticking out of the ground and the disturbed dirt from the trench to the high-voltage lines in the background. It sort of looked like a sandbox, so would have been easy to miss.
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I did also drive around in Salina, Hays, and Limon, CO near their respective exits on I-70, but didn't find any signs of construction. I spent 15-30 minutes driving around each of these cities. If the other cities aren't any further along than Goodland, it would be difficult to spot the location without knowing exactly where to look. At first, I was wondering if there was any actual progress in Goodland when I pulled up.