The announcement, which can be found on their website, states the following:
After a long break Nemeth Designs would like to share a few screenshots of our newest project, the Bell 407 for Prepar3D V4. No exact release date yet but will happen sometime in Q1 of 2018.
This was an abandoned project that we were planning to release for FSX but we felt that the steam was going out from that platform so we let it rest for a while. Based on that old engine P3D introduced several very interesting new features including the long due graphics upgrades, performance tweaks, implementation of advanced helicopter flight engine and a lot of necessary fixes for bugs that menaced the old FSX platform.
The Bell 407 will come with 4096x4096 HD textures, full P3D V4 comapibility, more variations including law enforcement that will feature render to texture screens for its surveillance systems. Also, we want to release it for FSX Steam Edition but of course some of the newest features will not included in that.
These are great news for the helicopter community in P3D v4.