I would have to agree with BigRed about War of The Ring's game mechanics making a positive impact on WFB. I would love to see certain elements carry into Fantasy. I was never too into LoTR as a game system, but when WoTR came out I loved the design of it.
The movement system is great and fast for a ranked up fantasy army, magic is handled well in, and MAN combat is bloody. The dynamics of infantry interaction is great. Monsters are great VS cavalry, but weak against infantry. Cavalry can smash through infantry but struggle with monsters. Infantry can bog down monsters and render them semi-obsolete.
Magic in the game scales with each spell. Cast a spell and roll a die 1= nothing, 2-5= x effect, 6= better effect. Spells cost different 'charges' to cast. This is a very simplified explanation, but the War of the Ring system is quite a good rule set. Written by Mat Ward, too. Very surprising.