Correct me if I'm wrong, but isn't the only difference between a UHD drive and a standard Blu-ray drive nothing more than the ability to handle the latest DRM? From what I gathered in MakeMKV's forums a few weeks back, existing Blu-ray drives are already perfectly capable of reading UHD content off UHD discs, with the caveat that they have no way to decrypt that content. Meanwhile, UHD drives can decrypt that content, but they won't hand it over to any of the sorts of apps that I'm interested in sending it to, meaning that they're really only useful for direct playback.
For someone like me who only buys discs so that he can rip them to Plex, I have no interest in direct playback so I get no benefit from UHD drives. After all, once the DRM is cracked it shouldn't matter whether my drive is certified for use with UHD discs or not, since I'll be able to strip the DRM either way. As such, I plan to just keep using my existing drive (which I connect as-needed via a USB-to-slim-SATA cable adapter), or else pick up one of the existing slot-loading Blu-ray drives if I decide to put it in a build.