Please read the release notes at https://github.com/JoinMarket-Org/joinmarket-clientserver/blob/master/docs/release-notes/release-notes-0.9.6.md for details on what this release includes.
The first big change in this release (for which, please regenerate your joinmarket.cfg!), creates a new message channel for bots to communicate over. The TLDR is that makers serve Tor onions, and after initial rendezvous on "directory nodes", most of the transaction negotiation can happen peer to peer. IRC is still configured and will be for some time. All the message channels are used redundantly. Please read more about this in the release notes.
Another big change is that the default fidelity bond valuation no longer goes as the square of the bond BTC value, but (bond BTC value)^1.3 - this means that there will not be as strong a concentration of value in the larger bonds. Also, this value (the bond_value_exponent) is now configurable in the config file. Again, please read the release notes for more info.
A windows binary (.exe) is provided, as usual.