Because the last Sabbath/Maiden tour ended so well...Hopefully that rumored BLACK SABBATH, JUDAS PRIEST, and MOTORHEAD tour here in the States will become a reality. Now, if they could only find a way to add IRON MAIDEN to this, also.
For those that don't recall, Maiden co-headlined Ozzfest '05 with Sabbath...Maiden's last show of the tour was in San Bernadino, CA and to say it was a clusterfuck would be putting it mildly. Kelly Osbourne and her friends egged Maiden, they had their PA shut off three times, and Sharon came out after Maiden was done and berated Bruce until the crowd unceremoniously suggested she exit the stage using a four letter word starting with "c" and ending with "unt". Part of me felt like I got cheated out of seeing a great show, but having seen them a dozen times in the past 11 years, the other half of me kinda enjoyed it...one of the times the PA got cut near the end of a song, and without missing a beat, Bruce stood on the stage monitors and played conductor as 40,000 people sang the rest of the song that the band was unable to complete. It was simultaneously one of the most awesome things I've ever seen (40,000 people singing an Iron Maiden song while Bruce played conductor) and one of the most petty (because Sharon tried to deprive 40,000 paying customers of what they came to see).
The postscript to that is that the vennue EMPTIED after Maiden finished...I decided to stay because I had never seen Sabbath, but after a song and a half of Ozzy sounding like cats were getting strangled on stage I split.
So...all of that said 1) I'd be pretty surprised if Maiden toured with Sabbath and 2) I'd be extremely disappointed, because I have no interest in seeing Sabbath or providing any financial support whatsoever to Sharon Osbourne, and being forced to choose between maintaining that stance, and seeing Maiden, would be very painful.