The X1 specs are speculative, but the rest seem to be confirmed by Nintendo at this point.

• NVIDIA Tegra X1 SoC
  • 4 CPU cores clocked at 1020Mhz
  • 256 GPU cores clocked at 768Mhz while docked, 307.2Mhz while portable
• 4GB RAM
• 32GB Flash storage
• Extendable Micro SDXC storage
• 4310mAh battery
• 6.2“ 720p IPS LCD
• 802.11ac Wi-Fi
• Bluetooth 4.1
• USB-C for charging and docking

• 1x USB 3.0
• 2x USB 2.0
• 1x HDMI (1080p60 maximum output)

• Official FCC Filing

The following documents are held confidential indefinitely as stated in the confidentiality letter (long): Block Diagram, Theory of Operation, Schematics, Parts List
The following document are held confidential for 180 days as stated in the confidentiality letter (short): External photos, Internal photos, Test setup photos, User Manual

• Appl. No. 15/178972, Pub. No. 20160361627, GAME CONTROLLER USPTO
• Appl. No. 15/178991, Pub. No. 20160361632, GAME CONTROLLER USPTO Google
• Appl. No. 15/179011, Pub. No. 20160361633, GAME CONTROLLER USPTO Google
• Appl. No. 15/178984, Pub. No. 20160361640, SUPPORTING DEVICE, CHARGING DEVICE AND CONTROLLER SYSTEM USPTO Google
• Appl. No. 15/179022, Pub. No. 20170052750 & 20160361641, INFORMATION PROCESSING SYSTEM, INFORMATION PROCESSING DEVICE, CONTROLLER DEVICE AND ACCESSORY USPTO 1/2 USPTO 2/2 Google

• NeoGaf thread containing drawings from above Patents
• US Trademark and Patent Office search
• List of Nintendo Patents (not only Switch related)