Why is the replay function gone?

Replays weren't working for most games. It often left games in a broken state which had to be resolved with a hard reload of the page. This was a constant source of complains / support requests / discussions.

We appreciate this is an important feature and have every intention to bring it back asap.

Yeehaw.  :)

good shout on removing it from the interface until its fixed.

FWIW, I'd really like to have a well implemented replay last turn feature.  Thanks.

I think what the devs should do is implement a stable, comprehensive and usable output format (YAML, XML, or what-have-you).  That would let them not only develop their own official replayer, but allow third-party devs develop all sorts of great stuff, like offline replayers that have animation, sounds, etc.

And, of course, that would also let people export and save their game replays.