1) dunno, its a demo, so perhaps they will have the entire thing in there too in the final release - not sure if that would be needed tho, the most recognisable snippet of each of the anthems would do, wouldn't slow up the pace of the intro too much
2) I'd say so, would be odd not to (and could lend weight to there being only snippets of the anthems, imagine sitting through 2 full anthems?)
3) as above
4) haka is included and there has been footage of the beginning and end shown so far, so chances are its the whole thing
... isn't there an original post on this topic still going strong?