Instead of the standard pin grid array, Samsung's PM971 SSD uses BGA which allows them to for a much smaller overall size, albeit at the cost of it being permanently soldered to a circuit motherboard.  The three models, 128GB, 256GB and 512GB, will each be smaller than an SD card which is why these SSDs will be able to be used in future generations of small mobile devices.  This not only foretells of a significantly higher storage capacity for your phone but also a faster one as Samsung's PR describes sequential read speeds of up to 1500MBps and sequential writes at 600MBps, or if you prefer, 190K random read IOPS and 150K random write IOPS.  They haven't really given any details beyond those stats but you can try to glean some more information from the Japanese language article which The Inquirer links to in their story here.

"SAMSUNG HAS been showing off what it believes is the answer to the question of how to squeeze even more out of smartphone and tablet form factors. And with blazing speeds of 1500MBps it's hard to argue."

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