Finally, a full working S Voice .apk is back again, it works for android phones other than Samsung Galaxy S III. There was a leak earlier but it is not working because of sign-in issue. Thanks to XDA member ithehappy, check the original XDA thread here.
Difference with the previous leaked, the latest signing the application by fooling that your phone is a Galaxy S3, so non-Galaxy S3 users able to use the S Voice voice-command application again. Installed the S Voice .apk (28.69MB) in my HTC One X, it works good, tested on weather, messaging, setting alarm clock and application launch without problem.