SATA in Samsung Exynos
So does that mean that smartphones which use Exynos 5 will be able to connect to hard drives or optical drives by using SATA interface ?


In theory, yes.

In practice, the SATA interface will most likely never be exposed. If it is not used internally by the phone or tablet, it will probably be unavailable — if you were hoping for a phone with an eSATA port, sorry, but that's very unlikely to happen. (The connector would hardly even fit on most modern phones.)


  And also, does DMA in the figure ("32x DMA") refer to "Direct Memory Accessing" ?


"Direct Memory Access", but yes. Specifically, it means that the CPU can manage up to 32 concurrent DMA transfers to/from peripherals at a time.