I've read through a few of the updates. Anyone expecting a significant update to older armies, or any sort of balancing, will be sorely disappointed.
Looking at the major changes for Bretonnians now, they've made "Virtue of Heroism" into the USR "Heroic Killing Blow", invalidated a couple of our items and clarified that Damsels can now cast Magic missiles out of the second rank, which is handy. They also confirmed that pegasus knights still cannot be joined by a character on a pegasus:ireful2:.
Interestingly enough, because of the changes to the wording of the Virtue of Heroism, it now gives KB against everything, and doesn't stop a character using magic weapons:shok:. So, I can now use the Heartwood lance, virtue of Heroism and the Tress of isolude to hit on 2+, and have killing blow against everything with a reroll to wound. That's essentially an autokill against all tough targets now...
Woohoo. Teclis is back to awesomeness, all that talk of his killing hisself from is auto irrestible force miscast business is put to rest.
They had a note in the BRB that you can have Irresistible Force without having a miscast, through special rules and so on. Teclis was never in any real danger. He is now essentially even more amazingly powerful than he was before. Be careful though, using him now will be accompanied by many calls of "cheesy".... which he kind of is really.