I can't believe I am the only one who's interested in this ;)
There's a hint of it in the preview of the Ref2SE Phono
http://www.avguide.com/blog/exclusive-first-review-audio-researchs-new-reference-phono-2se-phonostage-preamp
Looks like the front face plate is changed too! Making it look more like the Reference Anniversary preamp.
Upgrades probably includes Teflon caps in the power supply (also used in the Anniversary pre)
It's slated to cost 1k more in list price, but there's an appointment only upgrade for current owners.