I have the new scripted tree and picture frame patterns on 12.2.1 photoshop CC on my Macbook Air, but they do not show up on my iMac. I am running same operating system, Mac OS Mavericks, and Photoshop version, 12.2.1, on both machines.
There was no Photoshop version 12.2.1. Since Photoshop CC is currently 14.2.1, I suspect that is what you meant.
Trees and some other scripted patterns will only be available if you have OpenGL enabled and meet the minimum requirements for using the 3D features. Older iMacs do not have a powerful enough GPU to use those features.