In this video, I demonstrate macOS 10.14 (Mojave) Public Beta running on various unsupported Macs. As of now, Mojave works almost perfectly on most recently dropped machines, but does have a few minor issues. The main issue at this point is the lack of graphics acceleration on machines with pre-Metal AMD/ATI video cards, but hopefully a solution will be found in the future. Pre-Metal Intel HD Graphics and nVidia GPUs work pretty much perfectly, though. If you'd like to give it a try for testing on your machine, you can download and run my Mojave Patcher tool found here: http://dosdude1.com/mojave
Please note that it is recommended that you run Mojave on these machine for testing only, and not as your main OS. Do not expect everything to work perfectly at this time.