The first is some planks that split up into pieces when the player shot them in some multiplayer video. This is a really good example.
Planks before: http://i1188.photobucket.com/albums/z406/Ark50/Planks1.jpg
Planks after: http://i1188.photobucket.com/albums/z406/Ark50/Planks2.jpg
Video: http://www.youtube.com/watch?v=tMPBBxpgzxU&feature=related
Second comes the building. I know what you thinking "buildings prob. cannot be blown up because too much space and bla" but this tells differently.
Building before: http://i1188.photobucket.com/albums/z406/Ark50/Building1.jpg
Building after: http://i1188.photobucket.com/albums/z406/Ark50/Building2.jpg
(video can be found at Crytek.com)
Third comes this wall blowing up. Look carefully. Also, this video i found is some really awesome first person gameplay without the etided songs and stuff.
Wall Before: http://i1188.photobucket.com/albums/z406/Ark50/Circle1.jpg
Wall After: http://i1188.photobucket.com/albums/z406/Ark50/Circle2.jpg
Video: http://www.youtube.com/watch?v=z468IMKXLiw
Fourthly and lastly comes the pillars. These are really great and easy to see so ill just give the vid.
http://www.youtube.com/watch?v=a2UCnblmOMY
go to 1:50 and watch from there. the pillars come in 3 seconds. I hope you guys emjoy the evidence i gave you

PS: 60 more days untill Crysis 2!!!!