Which parts ? The Application launcher ? The customizable desktops with widgets ? The notification center ? The settings UI ? The phone dialer ? The task manager ?
Please. Some meat.
Funny thing is, iOS has copied some of that from Android. Everyone looks at each other for inspiration. Its called competition. Look at Lexus when they released the IS300 with Clear Tail lights. Before you know it everyone had clear tail lights. Look at Wolfgang Puck when he made his "California" style Pizza's. Now gourmet pizza's are all over the place. This is business and the only people who seem to not want to play the business is Apple. They would rather crush and sweep all the competition up. Isn't that everyone here deplores Microsoft for doing decades ago.