I’ve tagged DragonFly 3.4.2. The major reasons for this point release were fixes for DragonFly under Xen with more than 2 CPUs specified, and for booting x86_64 DragonFly in KVM. The 3.4.2 tagged commit has every detail.
If you’ve already got a working 3.4.1 installation, you don’t need to rush to upgrade; this is mostly for the people affected by the issues listed above. I’m working on 3.4.2 install images; give that some time to complete and upload if you need one.