According to a post on the Battle.net forums, “It’s been a long time coming, but today we’re releasing 1.14a for Diablo II. This update focuses on system glitches introduced by modern operating systems. In related news, you can finally retire those old Mac PowerPCs. Included with the update is a shiny new installer for OSX.”
In addition, Blizzard also mentioned that they will be improving its cheat-detection system and hack-prevention capabilities. However that is pretty much all there is to this update, so if you were hoping for balances or new features or content, that will not happen. However based on this, it sounds like Blizzard has further plans for Diablo 2 in the future, although how extensive remains to be seen.
Blizzard adds, “There is still a large Diablo II community around the world, and we thank you for continuing to play and slay with us. This journey starts by making Diablo II run on modern platforms, but it does not end there. See you in Sanctuary, adventurers.”