Samsung usually produces both Exynos and Snapdragon variants of its flagship phones, the former mostly used in non-LTE versions. However, the company didn't mention Exynos at all during the Galaxy S5 event. Now Samsung has gotten around to announcing two new Exynos 5 chips, one of which is probably going to be in the GS5.
The Exynos 5422 is a small spec bump over the 5420 announced last summer. It consists of four Cortex-A15 cores and four Cortex-A7 cores in a big.LITTLE configuration.