Blah blah I'm Infernoburner Blah Blah Blah. Whatever, the title of the thread is self-explanatory.
Here's the link to the promo trailer: http://www.youtube.com/watch?v=eglXlAZFsZY
0:03- The shield the Sallet Knight has is unobtainable. Also note the shield the Plate (Catfish) wears is more blueish than it's current version.
0:07- A very ugly looking heart instead of the precious ones we have now.
0:14- Strange Party Button, the Tailed Helm has a Freeze Calibur that she charges and releases shortly after
0:21- A sword drops in the Scarlet Fortress-like arena, udentified by me tough
0:24- Gold Trojan; A crown out of bounds in to the Northwest
0:25- Awesomesauce Vog Cubs in the Scarlet Arena, the current player wears Megalodon gear
0:28- Zombie Apocalypse on an unknown level, the player wears the old Valkyrie Set, Baby Greavers??
0:43- Strange, already pressed-gold button???
0:50- Spammable bombs in yet another deleted Scarlet Fortress level
1:00- Freeze Kats that are the size of the current Black Kats, also notice the fire pot is a shade darker
1:03- OOO implies their game contains no grinding, hwahah
1:15- Tortodrone
1:17- A player who's name can be seen for 1 half second, Bandersnatch, angers the Tortodrone
1:24- Old Spiral Knights logo, personally liked it better
From my little "analysis", it seems the Scarlet Fortress was first meant to be a Gauntlet-like world. That's probably why the Gauntlet uses Scarlet's tileset.
0:22 Sword and bomb drop at once from monsters.
0:28 is a home of Tortodrone. Baby greavers are old skin of silkwings. Also old caliburs had Sealed sword attack combo.
0:43 is an elevator. One of players have Purring Cap
0:46 one of knights have old proto gun skin.
0:54 turret in left, up cornour have (probably) diffrent skin. Knight in right, down cournor have deleted shield.
And about no grinding... it was beta ho ho (look at chat)
Also i don't know, why the hell normal, non-charge-must attack of bombs was deleted. Weak, fast attack? Lol, why not?