"and it looks like they're finally improved on what was a terrible, clunky, extremely dated UI." doesn't hold true, it's mostly the same UI with a dark reskin. Certain editor hot paths have been reworked and that's about it.
The editor is almost exclusively written in Slate, Epic's in-house Window framework/general GUI module. Slate's got a pretty interesting nested MACRO system. Most definitely not data-driven and pretty much as hard-coded as it gets, redesigning the editor for real would be difficult to say the least. In reality most experienced developers don't want a new design, they are happy with the workflow they have and I have to agree with them. I'm generally happy with the "if it ain't broke don't fix it" reskin decision.
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