>>24519395
Over the past few decades, in addition to adding new manuscripts into the textual apparatus, they've been editing a massive project called the Editio Critica Maior (ECM), built using a new-ish method of textual criticism called the Coherence-Based Genealogical Method (CBGM), using computer tools to examine all the available manuscript readings to best determine the textual evolution (i.e., the genealogy of the readings), and thus best determine the original reading, using two component methods called pregenealogical coherence and genealogical coherence. The UBS5/NA28 utilized the ECM for the Catholic Epistles, since it was the only thing available before 2012; now, the ECM editions of the Gospel of Mark, Acts of the Apostles, and Revelation are available, and have been incorporated into the forthcoming UBS6/NA29. Likely, the UBS7/NA30 will come out in another decade or more once the remaining volumes of the ECM are complete; they claim they'll finish the ECM by 2030, but considering these are the same sort of people who initially planned to publish the UBS6/NA29 by 2022 (and considering that the Biblia Hebraica Quinta was originally planned for 2010, but is now planned by 2032), you always have to add extra years to their projected dates.

One interesting result of the ECM is that many Byzantine Majority Text/Textus Receptus readings (think KJV, NKJV, Eastern Orthodox Bible, etc.) of the NT are being given greater weight than they were given by past critical scholars. The promo summary for the UBS6 states this:
>Textus Receptus wurde gegenüber früheren Auflagen verstärkt berücksichtigt.

More ECM resources:
https://www.uni-muenster.de/INTF/ECM.html
https://www.uni-muenster.de/INTF/Genealogical_method.html