Months ago, guitarist Phil Collen confirmed that Def Leppard would hit the road again in the summer of 2011. While we don't have any dates yet, I'm fairly confident the band will be swinging through North America. When Phil confirmed the tour, he also said the dates would likely begin in May.
So, I'll ask again - who will tour with the Leps? The last time I saw them live, Billy Idol was on the package. Def Leppard has toured with just about everyone at this point. All indications are pointing that this will be a "light" summer for our bands on the road. If Motley and Poison really do tour together, that's two bands that can't travel with Def Leppard. Apparently Ann Wilson said Heart would be touring with the band. If it does happen, I think Def Leppard/Heart is a good package - but one more band would be needed to round it all out.
At any rate, I suspect the tour will be announced within the next few weeks. Oh, and if you're ever looking for an awesome database of Def Leppard history I stumbled across a cool website that you should check out!