No official link yet, but sources at brewerfan.net are saying that Fielder is in Tampa Bay and is set to likely DH for the Brewers against Tampa and Toronto. He's homered in his first start at every level he's played at (Ogden, Beloit, Huntsville, and Nashville), so maybe something big is in store for today. I would assume, unless some drastic trade is made, that Prince will be up for these six games and then back down, so his fantasy value is likely minimal. Still, it will be nice to get a glimpse of the future with Weeks, Fielder, and Hardy all playing.
No transaction has officially occurred yet, so he may or may not debut today.