You are matchmade in the Level 28 Version of Prison of Elders. All other modes require fireteams.
Please discuss all things pertaining on Prison of Elders. Opinions, Facts, and Comments welcome.
Edit: Thanks to TheFrozenInferno we have more sources.
https://twitter.com/destinynews_net/status/595786983865221121
Edit 2:
32-35 mode has minibosses.
You get loot for completing an entire PoE Event.
[b][i]Loot includes[/i][/b]:
[i][b]28 Rewards[/b][/i]
25 Vanguard Rep
6 Vanguard Marks
House of Judgement Rep
Cryptarch Engrams
[b][u]32 and above[/u][/b]
Exotics
Queen's Weapons
PoE Armor (32+)
Armor Core (32+)
PoE Weapons (34+)
Weapon Core (34+)
Etheric Light (34+)
Motes of Light
Shards and Energies
Judgement's Chance (35 Reward.)
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Matchmaking is lazy, and results in a team that is ill prepared for the activity. Hopefully bungie listens and makes it optional. As in, choose whether or not you will be put in matchmaking when you start a multiplayer activity.