I have a few idea's which could make the Coliseum more interesting.

Here's a quick summary of the ideas I have.

Here is are all the ideas written out.

A new interface.
When clicking on the Coliseum tab you are welcomed with 2 large icons representing Lockdown and Blast Network. Almost centered, just about a bit on the left. On the right you will have an empty player list which will get active once your guild starts to queue for a game. This list will remain visible in every tab.

Beneath the icons you can choose between the options you have today: Random team, Free for all (Blast Network), Guild Team and also spectate. Describing who are waiting and playing will be indicated from left and right around the buttons. (example: Lockdown is Left and Blast Network is on the right. People playing and waiting at Lockdown will be shown on the left of the lockdown buttons. For Blast Network on the Right)

On the top you will have mission like tabs: Queue and Leaderboards. Just like in the Mission interface you can view your prestige, you will be able to see your Coliseum score instantly.

Duel Mode. (1v1 Lockdown)
This might have been asked a lot.
Chivalry has applied a feature like this: to avoid people not doing the objective. This way, there will be no interruptions for the dueling players and the people who are doing the objective can worry less when they lack

An extra addition for Duel Mode could be a fee which the two can deposit. Winner takes all.

Goodbye current points system, hello Ladder Points!
Instead of the current system, we could adapt a system similar to the game Trackmania, which are ladder points.
You begin with 0 points and the maximum is 100.000 points. When you begin a game, you will jump in points a lot. As you progress, getting points will become more and more difficult. So is obtaining 100.000 points going to take you a crazy amount of time. To obtain points faster, you have to score good among players with a higher score than you. As time goes by and you haven't played any game, your points will drop. Of course, the more points you have, the faster they drop.

(Possible extra feature: Maybe you're not much of a mission person. Maybe you prefer to show your friends the ladder points you've achieved rather than the prestige, or maybe even both. Underneath the prestige, when you inspect someone, you will also find the ladder points of the player. You can select if you want to show Lockdown points or Blast Network points, or both.

The leaderboards.
The leaderboards will show the top 10 with the most overall points, but you can also view people with the most progress in a week.

Instead of 3 separate leaderboards for each game we'll organize them into tabs.
You can turn the leaderboards into the usual Global, Friends and Guilds.
As a new feature: inside these leaderboards you could also search for yourself, or someone else (or a guild) and view the others which are just above or underneath you. An extra addition for this system could be balancing. A player can decide if they wish to play with people around their own rank points, or completely ignore this feature.

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These are just some idea's. Please let me know what you think. :)