OnePlus is a Chinese smartphone company founded by Pete Lau, formerly the Vice President at Oppo. Their first phone was basically invite-only for most of its lifespan, but that was justified for a flagship-quality phone at $299 USD. The OnePlus One was first available in April 2014. Their follow-up is the OnePlus 2, go figure, which will be formally announced on July 27th.
Several announcements lead up to that date, though. One day, OnePlus stated that the announcement will be done in VR, and they are selling Google Cardboard for “free” outside of the $5 shipping fee. Another day, they announced that the price will be “under $450 USD”. Today, they announced that the OnePlus Two will have 4GB of LPDDR4 RAM, matching the capacity of the ASUS ZenPhone 2. It will also contain the Qualcomm Snapdragon 810, which should be able to support OpenGL ES 3.1 and Vulkan (whenever that arrives).
It makes you wonder what's left for July 27th, besides the release date. My guess is that day.