pretty sure you have to look for the new content, took me about 3 irl days to even find any new items, also hint to where the Aether Biome is: same side as the jungle, and in the Cavern layerThe game says 1.4.4 Build 960 in the corner, there’s no App Store updates available, and I have the new achievements, but there’s no other update content like Shimmer/The Aether, town slimes, and new weapons.
the current version of Terraria on mobile is v1.4.4.1. check again for updates.