Final dev kits as in no longer a prototype, and likely in the retail shell. Yes, the documents stated that the prototype 2 kits had the final spec, but that doesn't mean it's the final kit. The final kit is likely going to look exactly like the retail model of the Neo, whereas the prototype models typically are just plain looking boxes to hold the components.
And yeah, sometimes final kits can get a bump here and there, what we do know is we're not going to get a downgrade from the specs listed in that document.