Premiere of Samsung Galaxy S9 and its improved version named Galaxy S9+ is planned for first quarter of 2018, and for this moment we don't have any confirmed information about these devices. We can only deduce that Galaxy S9 will be the first device available on market with Qualcomm Snapdragon 845 processor, but today we received rumor which reveals in which color options we will be able to buy Galaxy S9.
Basing on this rumor we can say that Galaxy S9 will debut in four color options: black, gold, blue and for the first time phone will be available in purple color. For now Samsung doesn't have any official names for variants with these colors, but we’re sure that it's just a matter of time.