Uniffied OS means that  there will be probably two pieces of hardware with same os, sharing games, handheld sonsole and home console. its easier to do , than one powerfull handheld/console hybrid. 

for example there will be 2 separate configuration -  Handheld console with AMD APU  - 4cores Puma+ cores@1Ghz, 2GB of ram and 512SP GCN 1.3 RAdeon and home version With 8 Core Apu at 2ghz Puma+ Cpu, 8Gigs of ram and 2048 SP GCN radeon , both sharing the same os and games. like on two difrent PC configuration.

 on handlheld, game will run with 720p/sub 720p resolution, low/medium texture details, medium shader effects, medium shadows, no antyaliasing at the same time this game on "Home Console" will run at 1080p/high tekstures,shadows,shader effects, better physics, aa. 

One game, One OS, Two Consoles, Two configurations. Like on PC, but with predefinied configurations.

It's a chromecast dongle!

its prob the fusion

Probably the next handheld.

Idk much about specs, how powerful would that make them?

"NX" is the platform, and both handheld and console will run this platform. The handheld will release first, then console soon after. Some games will run on both of them, but some games will be different on each device to take advantage of each's strengths (console for power, handheld for portability). Both devices will allow games to be developed in the same environment and the engines will be used for both as well.

Fusion. Holiday 2016 launch.

Fake edit: So Fusion is the OS fuse? And there will be a handheld part and a console part? Handheld part will be the first one launched.

People need to get it out of their head that there won't be a hybrid system. the only thing close enough to a "fusion" will be the ability to play games for either console on the console you want to play on.