This release introduces MTU config parameter for client and server. By default, it is equal to zero, meaning that WireGuard will determine MTU automatically. If your configuration requires setting MTU manually, you can do it now.
Additionally, when you configure the new interface using the setup wizard, DNS now includes failover addresses, as well as IPv6 addresses of resolvers (in case you have NAT for IPv6 enabled). Existing configuration won't be upgraded. If you want to use IPv6 DNS, you can use following settings (line for the DNS resolver of your choice should be put in 0001-server.toml):
# for Google
ClientDNS = "2001:4860:4860::8888, 2001:4860:4860::8844, 8.8.8.8, 8.8.4.4"
# for Cloudflare (1.1.1.1)
ClientDNS = "2606:4700:4700::1111, 2606:4700:4700::1001, 1.1.1.1, 1.0.0.1"
# for Quad9
ClientDNS = "2620:fe::fe, 2620:fe::9, 9.9.9.9, 149.112.112.112"
# for OpenDNS
ClientDNS = "2620:119:35::35, 2620:119:53::53, 208.67.222.222, 208.67.220.220"