Samsung is preparing a new line of smartphones, which will be referred to only as Galaxy O.
But then SamMobile stumbled upon two new smartphone Galaxy Mega On and Galaxy Grand On, which have the same model number as listed above. Probably smartphone with model number SM-G550 will be available as the Galaxy Mega On, while the SM-G600 will be officially named Galaxy Grand On.
By the way, Samsung is working not only on new smartphones, but also on a new single-chip platform, code-named Mongoose (Exynos M1), which will include proprietary processor cores. The new chip scored 2136 points in single-core test Geekbench and 7497 points in multi-core test.