Beats by Dr. Dre Mixr headphones have already been released in select countries, below is a link to them.
The price of Beats Mixr headphones in the United States from the Offical Beats by Dr. Dre website are $249.95. Taxes vary depending on where you live. Note: Prices may vary in different countries. Not all models available in all countries.
David Guetta's Beats by Dr. Dre headphones are called Beats by Dr. Dre Mixr headphones. I have provided a link to them below this answer.
Yes
The boxes for Beats by Dr. Dre headphones are fairly big. I have a pair of Beats by Dr. Dre Mixr headphones and the box is 17.2 cm X 23 cm X 11.8 cm = 6.8 in X 9.1 in X 4.7 in. I think all the boxes are around this size.
Looks like on the ear to me, hence the lower price than the studios
Beats By Dr Dre solos are available in many different colours and patterns on their website.
On-ear headphones - Mixr, Pro, Studio, Wireless, Solo HD, executives In-ear headphones - Heartbeats, powerbeats, tour, ubeats
You can buy Beats by Dr. Dre headphones in Australia at:BillabongCulture KingsDavid JonesDFS Duty FreeDick Smith ElectronincsDomayneFunk EarHarvey NormanJB HI FIJoyce MayneMyerNuancePinpointTelstra
Beats by Dr. Dre Wireless are the wireless Beats by Dr. Dre, below is a link to them.
There are wireless products (Beats Wireless) available for $280 on the website.
Beats by Dr. Dre is a line of headphones.