Under Siege currently supports some cool things like:

• Native 1080p (not upscaled )
• Replay recording with option to upload to YouTube
• Motion Controller support
• Splitscreen for Co-Op and Competitive
• 4 players online
• Video and voice chat in game and on lobby (with tiny windows on the corner!)
• Photo Mode (WipEout we envy you…)
• Custom Soundtracks

And off course a full blown in-game editor where you can:

• Create your own level (single player, multiplayer) or a full campaign with your story
• Use the same tools that we used to make the Single Player Campaign
• Upload it all for everyone to see (and make us sweat with the all the wrong possibilities that a tool like this provides)