Gobs vs. Elves
Ill start with the most requested buff: Cavalry debuff for spiderlings. IIrc we made it a armor only debuff with a pretty low percentage (around 10-15%). The most important MU to fix for 5.0 is Gobs vs. Elves.
Source: http://www.gamereplays.org/community/index.php?showtopic=963040