Tesla did a test drive event last Friday and Saturday in Harrisburg. One of the Tesla employees stated that the supercharger would most likely be right off the Carlisle exit between the Turnpike and Rt81. Hope this helps.
Nice. This makes loads of sense, and is better than New Cumberland. There is a nice parking lot that includes a Subway, a pizza joint and an ice cream stand just past the Sheetz off the Carlisle exit on Rt 11...that is where I would put it.
The project foreman of the Newkirk Electric crew that built the Cranberry Supercharger lives right near Hamburg. We actually discussed that the Cabela's plaza there would be a great site as well. And I am sure he would love a project so close to home! Maybe if the Whitehall / Lehigh Valley Mall location doesn't pan out, they would go after Hamburg. Whitehall has the advantage of being much closer to 476 as well. And they definitely don't need both sites.
PS, I often stay in Wyomissing when I do work for UGI Utilities.