One thing I wonder is, if they're using the original Lips in this, had they been using it the whole time since 2009?
When Lips made his return in Christmas at Rockefella Center, I thought it was a new puppet. It looked a bit different from the original (not as good as the old one). Then when he appeared in The Muppets, I noticed he looked a lot more like the original than the rebuilt (I assumed at the time) one from 2009 did, and wondered why they would have rebuilt him again so soon after doing so.
Then I asked about this somewhere on Muppet Central about a year ago, and somebody said that the one in 2009 actually was the original while the 2011 one was a new puppet. With that info I guessed that he looked different in 2009 due to "puppet ageing".
Then again, I assumed that most of the long-unseen obscure characters who appeared in The Muppets were rebuilt. I figured the only ones that were the originals were ones used only in the finale and ones used only in the Gulag scenes in Muppets Most Wanted, since those ones weren't used much. But then again, many of the obscure characters who returned in the last two movies who I assumed were rebuilt - Droop, Nigel, Annie Sue, The Mutations, Afghan Hound, Bobby Benson, Wayne and Wanda, Marvin Suggs - I couldn't really tell a difference between those and the older puppets (well, with Marvin Suggs being a whatnot, he tended to look a little different in almost each appearance during The Muppet Show era). I'm pretty sure that Uncle Deadley was newly rebuilt (since he had a main role), and Thog was definitely rebuilt (aside from there being a big visual difference between the original and the current ones, it was confirmed by a former Henson intern that the original had deteriorated long ago).
Back on the subject of Lips, I must wonder if his arm wires are connected to his elbows instead of his wrists. The only times I've seen him with arm wires are in behind-the-scenes photos (including one of the recent photos). In productions, the wires never show (not even in the era before it was possible to digitally remove arm wires). For a long time I wondered if I had just been seeing things when I saw pictures of Steve using arm wires for Lips and if he was actually a live-hands puppet, since his fingers move when he plays the trumpet, his big sleeves could easily hide the performers arms, and when he's wearing outfits with sleeves that aren't so oversized, it seems like his elbows reach the bottom of the screen. If the rods are attached to his elbows instead of his wrists (and he wouldn't be the only Muppet whose rods are attached to his elbows, Bert had arm wires in his elbows during the first season of Sesame Street), perhaps the large sleeves/having his elbows at the bottom of the screen just blocked those wires, though I'd be surprised if they were deliberately trying to hide them (since for many years they usually didn't try to hide the arm wires of other characters from audience view).