Shadow Blade Megatron is in a very Decepticon black and purple scheme, looking to G1 Skywarp possibly for his new paint job, and Roadbuster Ultra Magnus is in, well orange and green, using G1 Roadbuster's colors for inspiration.
Just like the G1 counterpart, Roadbuster had never made any appearances at all in the cartoon show. Too bad Transformers Animated has also followed suit by not having him in the show.
Below is the source of where this news come from;
Source: Seibertron & transformertoys.co.uk