Actually, they have not shown much.
Some CGI gameplay, fake crucible gameplay within a closed LAN environment, and some static pictures.
Not enough to show there is actual content there yet.
Plus, the wonderful tagline they always put on, and seem to always use "subject to change"
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Well everybody has used that tagline so it isnt just bungie. Although that doesnt exactly say there's gonna be change.
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To this point, Bungie has used it 100%. Definitely changed in each case from what was presented.