It appears that OnePlus 2 will be available in three different variants. The latter got caught in a Bluetooth SIG authority filing.
The trio of OnePlus 2 version have three different models - A2001, A2003, and A2005. All have been certified with hardware version 2.2 and software version 2.01 for Bluetooth 4.1 specification.
The OnePlus 2 A2001 will likely be the base model with Qualcomm Snapdragon 810 v2.1 SoC coupled with 3GB of RAM. OnePlus 2 A2003 will pack the same SoC, but will feature 4GB of RAM.
So far, there is no clue on the OnePlus 2 A2005 hardware. It will likely be the range-topping variant with the most built-in storage.