Most notable are the sleeve stripes, which have been moved to the compression shirts:
What a novel idea, preserving 1960s design with twenty-first century technology. If Oregon State can do this, then why can't the Packers?
UPDATE: Paul Lukas posted more pictures of the uniform on ESPN.com as part of his coverage of the unveiling:
The undershirt looks pretty good in its own right. I can easily imagine a green-and-gold version for sale at the Pro Shop:
Here's Paul's take (emphasis mine):
Surprisingly old-school, no? ... Hard to believe this is the same school that wore that sports bra design a few years back. ... A few minutes before the unveiling, a guy from Nike introduced himself to me, pointed at this design, and said, "I worked on all of these, and this is the best one of the bunch." Hard to disagree. ... Matte-finish helmet is interesting. ... Putting the sleeve stripes on the undersleeves, instead of on the actual jersey, is probably the future of football striping.We can certainly hope so.