Interesting but I just checked and https://www.samsung.com/us/support/owne ... 7PC128N/AM
shows the last firmware update for the 830 SSD as Jan 19, 2012
Also https://www.samsung.com/us/support/owne ... Z-7PD256BW
shows the last firmware update for the 840 Pro as Dec 13, 2012
The page you linked to has updated 2013 firmware for the 840 and 840 Pro but not the 830 (which is still and always will be stuck on the Jan 2012 firmware).
The contents of the 840 pro firmware are dated May 7th 2013 so it appears they may have been there for a few days but they aren't linked to from the support download page for specific drives yet.
Don't know if that is a support decision (not fully recommended for all users) or just a web admin being slow to update the site.