In a leaked photo it becomes more then apparent that Samsung is about the release the 850 EVO series SSD, these will feature new TLC 3D V-NAND flash memory. The new series will likely have slightly shorter lifespan and perf opposed to the 850 Pro, but the EVO series always has been all about performance for money.
The SSD as such will be based on Samsung's 3-bit (TLC) 3D V-NAND chips and an updated three core controller processor.
Here's the photo that leaked on Expreview: