Movement: The need to change movement leaves me bewildered - but maybe randomness won't matter as much if there's no great advantage to charging (though we don't know that yet). Units SHOULD have to wheel to avoid each other and from getting mixed in and confused (i like how this worked on ROME: TOTAL WAR - oldie but goodie)
Percentages: I'm glad to see that. Anybody else tired of meeting Archaon in every little skirmish with Chaos?? I'd hate to be in charge of his social calendar. Saving the big boys for major engagements will be a good thing. In this I agree with Eldargal above - very well put - more core units and less Herohammer! Also, I never use minor characters like Engineers because they take up precious character slots. This way you can use more characters if you buy cheaper ones. More flexible. Sounds good to me.
It also sound like they might have taken a page from Warhammer historical with big units not breaking immediately. In Warhammer Ancient Battles I play imperial Romans, and you may slaughter the Celts, but if they outnumber you 2:1 then they "Fall Back in Good Order", basically a pushback but not broken. A very good rule - I mean, even Chaos knights should be overwhelmed by sheer numbers of gobos or clanrats or halberdiers, etc. (remember the fight with the Kurgan against the Scots in Highlander? Sure, he ran McCleod through, but the Scots jumped him and swept him away).
Objectives: I never liked this idea - a very 40K thing, not what you expect from many major medieval engagements. I mean, the hill might be part of the pre-battle skirmishing for high ground or for besieging a town, but the main objective was to wipe away the enemy. In most battles I remember, the losing army retreats or is scattered - they don't stay to hold a hillock. But, hey, if it encourages more Core units then I'm down with that.
Overall, I like it. Hope most of these prove true.