No, this is not an official announcement that the Brewers are hosting a Billy Joel concert at Miller Park this year.
But it could potentially be a clue.
Web browsers including those at the Journal Sentinel (hat tip to them for finding it) surfing on the internet discovered a url with mlb.com/brewers/tickets/concerts/billy-joel on it early Wednesday afternoon. (It is very possible they may have taken the page down if you read this story after that time, a point the Journal Sentinel also made.)
If the concert announcement scheduled at 10 a.m. is for Billy Joel, it would be the first time the veteran rocker from New York will have played Miller Park in a concert.
He previously played County Stadium with Elton John in 1994.