As Lukasz announced on Ubuntu Quality mailing list there is a first set of release candidate images for 18.04.4. These images are ready for testing on the ISO tracker.
Please pick your favourite flavour and start testing. As with every point-release: do keep in mind that any bug that was also present in 18.04.3 isn’t considered a blocker, and minor regressions can be dealt with post-release, but if you find something dire and boot/install critical, we need to hear about it yesterday so we can get it sorted by release.
Happy testing!