I probably missed it, but will ask anyway, is there
a list of the areas that are being tested? Anything in the Northern
IL or Southern WI areas?

Nothing in those areas, at least not for now. I have most of the locations
pinned down, but I have not posted them on a "public" URL. A few of the
utilities and one of the BPL manufacturers (Ambient) is being very cooperative.
One of the promises I made is that ARRL will help them determine the
interference potential of BPL systems, but that we will do it in a way that is
minimally disruptive to them. Having hordes of hams showing up in these areas
would probably not be a good idea, especially seeing as it would only take one
of the ones who offered to use the couplers for target practice to undermine
months of building good will.

If you are willing to do a more quiet foray into the test areas, email me and
let me know and I can provide some info, although it will be a good drive for
you.

I have posted the cities involved, and can repeat the list if it is needed.

73,
Ed Hare, W1RFI