What is it? Just say what it is. Hard to see anything worth noting with just a picture.
if you look at the picture carefully, you'll be able to know what are missing on the stage set (live shows only, excluding the battles and blind auditions stage).
1. the towering, giant hand statues (of course). it's the trademark of the Voice. At first, there are four hand statues at first (not counting the one hand statue at the auditorium), there are four hand statues on the live show stage set. two are left-handed and two are right-handed. Moreover, one (hand statue) from each side is on the front corner, and the other is on the back corner (seen in the first two seasons and in the first four weeks of season three's live shows). But, in the top 6 live show of season 3, the hand statues at the back corners were removed. Since then (until season 8), there were only two hand statues, which were on the front corners of the stage. However, again, when I saw season 9 live show stage set, I felt happy and sad at the same time. I am happy because it looks bigger, whereas the area is actually still the same as the previous seasons.
2. the ladder at the center, back of the stage. it was in the first eight seasons, but the producers had removed it in season 9, and it has remained ever since.