Conversation so far:
what took place after Uncle Tupelo broke up?
Jay Farrar searched for members for a band of his own. Jeff Tweedy was able to retain the rest of the Uncle Tupelo lineup, and created Wilco.
when did Wilco start recording?
Wilco began rehearsing a few days after the final Uncle Tupelo concert, and by August 1994 they were in the recording studio for their first album, A.M..
Are there any other interesting aspects about the Uncle Tupelo article?
Regarding the possibility of a reunion, Mike Heidorn reported in a PopMatters interview that nothing's ever for sure, but I would have to say, 'No such thing' .

Question: Did they ever reunite?
Self-contained rewrite: Did Uncle Tupelo ever reunite?