Of course, Samsung doesn't want to be outdone by Apple, so they have been working hard to knock out the development on their first 64-bit chip to stay on par with Apples new 64-bit A7 chip. According to recent reports out of Korea, Samsung is nearly finished with the development of their 64-bit Exynos chip. Additionally we are hearing renewed intel that the first device which will support this chip is likely to be the Samsung Galaxy S5. This simply corroborates some of our earlier reports on the subject. Here's a quote with more of the details,

Rumors say the chip will utilize a 14nm process and be based on ARMís big.LITTLE platform, much like the current Exynos 5 octa. The eight-core chip would deploy Cortex-A53 and Cortex-A57 cores with the ability to push all cores simultaneously while offering reduced power consumption. It would mark the first time Samsung has offered a 64-bit processor in one of their smartphones.
For the laymen out there, the fact that either chip is 64-bit doesn't really do much for mobile devices right now, and it still won't for the near future. The primary advantage of 64-bit processing is that the chip can access greater than 3GB of RAM. It remains to be seen if that is necessary yet in smartphones. For the most part, the most powerful smartphones available do fine on 3GB or less. Of course, as games and other apps grow in complexity, more RAM will eventually become necessary. We are unlikely to hit that roadblock until sometime toward the end of next year or early 2015.

Source: Phandroid