The most notable change is that from now on the download format of your probe's measurement data is JSON. The actual syntax is pretty much self-explanatory.
The DNS anycast map now visualises server versions and SOA serials too.
We made further changes to the way we show static network configuration of a probe on the "probe status" page.
We're making preparations to include Atlas in RIPE NCC Access, the RIPE NCC single sign-on system.
Beyond these changes, we've made some enhancements to the scalability of the upcoming User Defined Measurement feature and did some additional internal ("invisible to the users") modifications.