It looks like Samsung is ready to take on Siri, but is having trouble containing it.
However, the S Voice software has managed to leak out into the wild. Earlier this month, hackers allowed it to run any phone running the latest version of Android, version 4.0 also known as Ice Cream Sandwich. However, now,
S Voice truly is a Siri clone. It encourages users to speak to the phone in normal human speech as opposed to only being able to use a few stale, specific voice commands.
There will no doubt be a whole bunch of analysis comparing the two services as S Voice gets more ingrained into the market, which is exactly what Samsung wants. It wants you to compare its phones to the iPhone, not to other Android phones.
S-Voice was just recently officially released for the Galaxy S III. Early reviews give it tepid acclaim, treating it with the same praise and the same criticisms as Siri. It is unclear if the official rollout will (officially) be extended to other Samsung devices.