Yes a few movies are released on Blu-ray in 4K. The movies like Amazing Spiderman or Total Recall are Mastered in 4K. In the near future it should be more movies available in 4K resolution.
The Blu-rays can be used in your Blu-ray player or Playstation 3. You can watch this movies on your Full HD TV, too. But to enjoy the 4K resolution you need a 4K TV.
List of 4K Blu-rays