http://www.pcgameshardware.com/aid,701429/Diablo-2-Blizzard-launched-Patch-113-open-Beta/News/
http://forums.battle.net/thread.html?topicId=21730644778&sid=3000
- Support for blit scaling in windowed mode. The game can now be maximized to the largest 4:3 resolution supported (hooray widescreen users).
- Added new command line parameter '-nofixaspect' which allows users to not fix the aspect ratio to 4:3 when maximizing windowed mode. This lets the game 'stretch' to fill your monitor.
So if I am reading this right, windowed mode will now scale up in 4:3 and have the option to stretch for wider aspect ratios?