I can't get my hopes up about Iron Maiden/Dream Theater, because if it doesn't happen my soul will be crushed with disappointment. That being said:
1. Bruce and Nicko are huge DT fans
2. Portnoy and co. love Maiden, and would likely drop previous plans to tour with them
3. Dream Theater have supported Maiden several times in the past
If this happens... No. I won't think about it.