Champion's Seal and Emblems in 3.2
Emblems of Conquest and Champion's Seals will not drop in the Trial of the Champion (5-player dungeon) on normal mode, nor will there be a daily dungeon quest associated with normal mode, though the items that drop in normal mode are quite good compared to other level 80 dungeons.

One Emblem of Conquest and one Champion's Seal will drop off each boss in Trial of the Champion Heroic mode. There will also be a Heroic daily dungeon quest added to the rotation for this dungeon that awards two Emblems of Triumph.

Item Levels in the Argent Coliseum
Here's a basic breakdown of the item levels for each dungeon:

Trial of the Champion (5-player) normal mode: Item level 200
Trial of the Champion (5-player) Heroic mode: Item level 213
Trial of the Crusader (10-player) normal mode: Item level 232
Trial of the Crusader (25-player) normal mode: Item level 245
Trial of the Grand Crusader (10-player) Heroic mode: Item level 245
Trial of the Grand Crusader (25-player) Heroic mode: Item level 258

In addition, successful tribute runs (Trial of the Grand Crusader only) will result in higher item level rewards from the tribute chest at the end.
 

Assuming you are eligible for all of the new dailies being added to the Argent Tournament -- meaning you have championed all primary factions and reached exalted with them as well as with the Argent Crusade and Silver Covenant/Sunreavers -- and plan on doing Trial of the Champion, the 5-player Crusaders' Coliseum dungeon on Heroic mode, the maximum number of Champion's Seals you can obtain in a single day will be 15 after patch 3.2 hits, not including any lucky Champion's Seal drops in the Champion's Purse.

Here is a breakdown of the costs of some of the Argent Tournament rewards in 3.2:

Argent Crusader's Tabard: 50 seals
Argent Pony Bridle (for your squire): 150 seals
Bind-on-Account chest pieces: 60 seals
Bind-on-Account weapons: 60-95 seals
Bind-on-Account trinkets: 75 seals
Argent Warhorse/Argent Charger (epic ground mounts): 100 seals
Quel'dorei Steed/Sunreaver Hawkstrider (epic ground mounts): 100 seals
Silver Covenant Hippogryph/Sunreaver Dragonhawk (epic flying mounts): 150 seals
Shimmering Wyrmling (pet): 40 seals