In spite of the expectations that the Exynos 8890 chipset go for mass production in December, rumors are suggesting that Samsung has already started making its own chipset.
If rumors are believed to be true, Samsung would probably ship the Galaxy S7 in February, followed by launching in January. The Exynos 7422 was going to be part of the Galaxy Note 5, but it is likely that Samsung will also partner Qualcomm for the Snapdragon 820 to be part of its phones.
If several rumors are to be believed, Samsung will ship the Galaxy S7 with some of the phone powered by Exynos 8890 chips, while another batch of Galaxy S7 could be powered by Snapdragon 820 chip-sets. Previously, Samsung had thought of its own chipset to power its phones after there the Snapdragon 810 reportedly faced overheating issues.
Exynos 8890 goes by code names like the M1 or Mongoose. The Exynos will be the first ever custom CPU core to made by Samsung to be part of its flagship phones.