They are:

  • The Desperate Hours 6k? (US and CA)
  • Hellraiser Quartet of Doom 4k (UK)
  • Hellraiser Quartet of Doom (UK)
  • The House by the Cemetery 4k (UK)
  • The House by the Cemetery (UK)
  • The Iron Fisted Monk (US and CA)
  • Witness 4k (US and CA)
  • Witness (US and CA)

Tech specs: Blu-ray.com (although they seem to have copied and pasted some details from the 4k to the 2k without adjusting)