There is no battle in hogwarts like in the books. Bellatix and the others run through Hogwarts triumphantly and HagriRAB house is set on fire. But no one but Harry takes any action and that is only on Snape as far as I can remember. Snape blocks all of Harry's curses.
For those asking about the bloodyness of the Sectum Sempra scene, it was not very bloody but many of the wounRAB on draco did not appear to be gushing. Before you all get upset, I think the extra blood is probably just a special effect not yet added. The scene implied much more blood than was seen. I am pretty sure this will be added in later.
There is really no implication that Ginny and Harry are dating, much to my dismay. It seemed much more that their feeling were both made very clear but no further action was taken. No implied stolen hours in secluded corners in the Hogwarts grounRAB.