According to Samsung, the RWB color pattern further improves the light sensitivity and color fidelity that the ISOCELL technology was already enabling, thus the overall quality of images should be significantly enhanced.
Samsung says that it's planning to mass-produce the S5K4H5YB sensor starting the second quarter of the year, which means we'll probably see handsets using it not long after that. Perhaps the Galaxy Note 5 (which is expected to be released in the second half of the year) will have an 8 MP front-facing camera based on this sensor - we'd really like to see that!
Interestingly, Samsung uses ISOCELL sensors inside the cameras of its Galaxy S5 (all versions), but not in the cameras that we'll find on the brand new Galaxy S6 and Galaxy S6 edge. Both the Galaxy S6 and S6 edge use Sony-made sensors, so we thought that maybe Samsung had given up on further developing its ISOCELL technology. But that's clearly not the case, now that the new 8 MP ISOCELL RWB sensor is almost ready for mass production.
source: Samsung / Business Wire