All the new models are based on models currently available from the company and first up are the $90 PX 100 IIi, and the $110 PX200 IIi. Both models conveniently fold up to fit into a case for traveling, and are based on the popular PX 100 II and PX 200 II models. They are a lightweight on ear type headphones with the PX200’s being of the closed back design.
The $80 HD 218i and the $130 HD 238i are headphones which are bigger than the PX range, and have a sturdier build with cushioning on the earpieces and headband. They still have earpieces that fold flat for storage. Having a closed back design the HD218i has a more bass heavy sound, while the HD238i are open backed for a more balanced sound.
The high-end IE 8i which will set you back $450 are in-ear-canal type headphones. These let you adjust the bass by using the tuning control on each earpiece, and come with replaceable cables. With the $100 MM 70i and the $140 CX 880i you have earphones that instead of fitting deep inside the ear canal sit just inside.
The new headphones are available immediately from Apple online and retail stores, and Sennheiser dealers.
Also See: iTunes 12.0.1 update release notes