I grew up in SW Wisconsin, and have spent the past year traveling back every 2-3 weeks to care for my Mom. As soon as you land in Milwaukee, you will hear "you betcha" instead of "you're welcome". This has not changed from my childhood, but some other phrases have disappeared or become less common, while others have become more generally used.
pop (soda)
down yonder & over yonder
rode Hank's mare = rode shank's pony (walked)
I had "ants" not "aunts"
crick = creek (no wonder I had trouble learning to spell)
"douse that glim" = turn out the light (that one facinated my husband,
who insisted it was a British thieves' expression)
My grandfather when badgered for a story would first always recite:
"I'll tell you a story about **** and Norrie, and now my story is begun.
I'll tell you another about Tom and his brother, and now my story is
done."