Apple announces iPhone 6 Plus Case and also iPhone 6 Case. Check official iPhone 6 accessories.
Apple page reads –
Make a statement. Cover every curve. Get fully charged. See all the essential Apple-designed accessories and more for iPhone 6 and iPhone 6 Plus.
These cases are available in Black, Blue, Pink, Green, White and Brown color options. Along with these Apple iPhone 6 Accessories page also recommends you to buy Beats by Dr. Dre Studio Over-Ear Headphones, Beats by Dr. Dre Pill XL Speaker, Powerbeats by Dr. Dre In‑Ear Headphones, Apple EarPods with Remote and Mic and Apple 5W USB Power Adapter.
Although pricing of these cases aren’t known, we can expect somewhere at $30 range for silicon and $10 higher for the leather option.