Sungreen, Sunchocola, Sunlemon, Sunpeach are some new introductions from Tokita seeds, the company that bred Sungold. You can guess the colors from the names mostly, although sunpeach is a pink.
They don't seem to be available in the UK yet but several seed suppliers in the US are listing some or all of them. Anyone tried them yet? Or planning to this season?
Some links:
Sungreen at Tokita's Japanese site
Territorial Seed carry Sungreen
Johnny's carry Sunpeach
I noticed Osborne Seed Company was listing all 4
Sunlemon at Osborne Seed
Sunchocola at Osborne Seeds