I got the notice in the mail yesterday; Charter is turning off their analog channels and going all-digital in their Wisconsin cluster as of the dates listed above (not sure about FdL or the Waukesha/Walworth communities). Looks like we'll be getting many more HD simulcasts (finally, the Weather Channel and Univision in HD!) which pretty much make it useless to go anywhere below 100, though at the loss of ClearQAM. Thankfully after hearing about their Texas and Michigan conversions I bought an HDHomerun PRIME for my PC with tuning ability, but others might not be so lucky.
They'll be offering one free digital adapter, cable box or CableCard for a year to customers who do need the equipment, since they'll now require boxes with every set.