There is Modifications and Bug Fixes description, isn't it?
Do you have any trouble with 140916? If not, no need to upgrade any firmware...

New functions:
(1)Added the support of TP-LINK Tether v2.0; This is a APP for smartphones to manage the router.
(2)Added the sip alg;
(3 )Added a new login domain “tplinkwifi.net” for we b-based management and "tplinklogin.net" is still available;
(4)Added the support for multiplayer online gaming with XBOX;

If you are not familiar with the above things, it means you don't need them in daily use...
BTW, once upgrade to this firmware, the configuration will lose. You need to log in via admin/admin and re-configure the router.

There is still a problem in Media server with last firmware 3.14.1 Build 141113 Rel.41164n (with previous versions too).
If are more than 3000 files (photos) in media server (no matter if in one or several directories) so only first 3000 files (photos) are displayed in uPnP client.
Tested on 4GB flash connected in TP-LINK and TV SAMSUNG UE48H6670 connected via wifi or wire LAN.

Answered you in another post.