The new Exynos isn't a 8-core processor exactly like you are thinking. It's one of the first new ARM processors using the BIG.little technology. NVidia did something similar with Tegra 3, that had 4 powerful cores and a fifth one with lower clock that was activated when idle to allow te phone/tablet to deactivate the quad-core component and go into a low power mode. But that isn't BIG.little, is just a simpler concept that can't achieve the same level of power saving.
In a BIG.little SoC (I will use Exynos as an example), you got 8 cores. 4 of them are the new Cortex-A15 powerful cores at higher clocks. The other 4 are weaker ARM cores woth lower clocks. The SoC (or the OS, depends on the implementation) can load balance between cores, always keepping only 4 cores running, in any combination between the high end ones or the low power cores. If you run a game optimized for dual cores, it will use 2 powerful ones and 2 weaker ones.
Of course, the weaker ones are basically as powerfull as the older Exynos on Galaxy S3 while the BIG cores are way faster. But in the end, it's a quad core processor that can choose between speed or low power in the go. It's about getting more power and more battery life at the same time and that is much more useful than a real 8-core phone.
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