Conversation so far:
When was reformation released?
On June 21, 2005.
When was their album released?
On June 21, 2005.
What happened with their reformation?
there was question as to whether other former members of the band would participate.
Did they want to get back together?
In April 2007 Iha and Auf der Maur separately confirmed that they were not taking part in the reunion.

Question: Why didn't they want to join the reunion?
Self-contained rewrite: Why didn't The Smashing Pumpkins want to join the reunion?