The unannounced Exynos 5450 SoC which will be a 2GHz chip with four cores. It will probably power Tablets than smartphones since its way too powerful for a phone which makes me think that Samsung would be having some other SoC in work for its future smartphones.
The folks at Phonearena were invited to the event were Samsung showed off its quad-core chips so you can hit the source link below for more details and some cool live pictures.