Current Xbox Series X devkits don't support HDMI pass-through and don't actually have USB Type-C ports, sources tell Thurrot.com's Brad Sams.

Last night AMD got into hot water by showing off an erroneous Xbox Series X render that showed two HDMI ports for HDMI pass-through and a bunch of USB-C ports. AMD later clarified the render wasn't actually from Microsoft and doesn't accurately represent the next-gen Xbox.
So what kind of ports does the Xbox SX have? According to multiple sources with access to Xbox Series X hardware, early versions of the system don't include dual HDMI ports and there's no USB Type-C connectivity.

Xbox Series X ports
3x USB 3.0 SuperSpeed ports (1 in front, 2 in back)
1x HDMI out port
1x Ethernet port
1x Digital audio port
1x Power port
1x Mystery port (possibly for devkit debugging)
Read Also: Xbox Series X new die shot teases beautiful AMD custom 7nm APU
Remember this info probably isn't based on the final version of the Xbox Series X, and probably reflects devkits (the big hint is the mystery port). The system will likely go through multiple revisions before the consumer-facing box is ready, but don't expect it to look dramatically different than the shoebox shape Microsoft unveiled at The Game Awards 2019.

Xbox Series X is due out by Holiday 2020. No pricing has been announced.
Check below for confirmed specs and details, and a huge content listing of everything we've heard about Xbox Series X so far:
Xbox Series X confirmed details (Formerly Project Scarlett):
- 8-core, 16-thread Zen 2 CPU
- Navi GPU on RDNA architecture
- Highly customized 7nm SoC from AMD
- GDDR6 memory
- 2x Xbox One X's 6TFLOPs of GPU perf
- 4x CPU power of Xbox One generation
- Can deliver up to 40x more performance than Xbox One in specific use cases
- Adaptive sync supported
- Super-fast SSD that can be used as VRAM
- Supports 8K resolution (likely media playback)
- 120FPS gaming
- Variable refresh rate (adaptive sync/FreeSync)
- Variable Rate Shading
- Raytracing confirmed with dedicated raytracing cores
- Backward compatible with thousands of Xbox, Xbox 360, and Xbox One games
- New controller with a dedicated share button
- Compatible with Xbox One accessories
Lockhart (Unconfirmed lower-end Xbox Series hardware)
- 1440p 60FPS
- No disc drive
- Super-fast SSD that can be used as VRAM
- 7nm AMD SoC w/ scaled-down 8-core, 16 thread Zen 2 CPU at 3.5GHZ and Navi GPU
- Lower GDDR6 memory pool (Possibly 12GB)
- ~6-8 TFLOPs of power?
- Aims to rival PS4 Pro/Replace Xbox One S
- Full backward compatibility with all Xbox One games
- Cheaper MSRP
Anaconda/Xbox Series X/Project Scarlett
- 4K 60FPS
- Disc drive with 4K UHD playback
- Super-fast SSD that can be used as VRAM
- 7nm AMD SoC with 8-core, 16 thread Zen 2 CPU at 3.5GHz and Navi GPU
- 16GB GDDR6 RAM
- 12 TFLOPs of power
- 2x GPU power as Xbox One X/aims to replace Xbox One X
- Full backward compatibility with all Xbox One games
- More expensive MSRP
Xbox Series X coverage:
- Xbox Series X new die shot teases beautiful AMD custom 7nm APU
- Xbox Series X will destroy PlayStation 5 with its MUCH faster GPU
- Xbox Series X rumor: launching November 22 for $499
- Xbox Series X GPU is better than any Navi GPU released so far
- Xbox Series X may be more powerful, but will third-party devs use it?
- Xbox Series X will boost performance of previous gen Xbox games
- PS5, Xbox Series X SSD may use software-defined flash to boost speeds
- Microsoft to 'virtually eliminate' loading times on Xbox Series X
- How the Xbox Series X will look in your living room
- Clarifying the Xbox Series X name
- Xbox Series X's custom SoC built with backward compatibility in mind
- Next-gen Forza is playable on Xbox Series X, is 'vastly different'
- Xbox Series X size comparison vs Xbox One, PS4 Pro, Switch
- Next-gen Xbox controller has a share button
- Xbox Series X naming scheme leaves door open for Lockhart
- Xbox Series X may allow suspend and resume for multiple games at once
- Microsoft reveals next-gen Xbox console, the Xbox Series X
- Xbox Series X may allow suspend and resume for multiple games at once
- Next-gen Xbox Lockhart has 'significantly less RAM' for 1440p gaming
- Next-gen Xbox Scarlett specs: 12TFLOPs, 16GB RAM, 3.5GHz Zen 2 CPU
- Cheaper next-gen Xbox Lockhart targets 1440p 60FPS
- Cheaper next-gen Xbox Lockhart targets 1440p 60FPS
- Project Scarlett devkits aren't widely available yet
- PS5, Xbox Scarlett SSD may use Optane-like ReRAM to supercharge speeds
- NVIDIA G-Sync monitors to improve PlayStation 5 and Xbox Scarlett
- Project Scarlett won't get VR gaming, Microsoft doesn't care about VR
- Next-gen Xbox Scarlett plays four generations of Xbox games
- Microsoft teases next-gen Xbox: 8K, 120FPS, super-fast SSD
- Xbox Scarlett CPU: 'no compromises', allows for 4K 120FPS gaming
- Microsoft: Xbox Scarlett will kick PlayStation 5's ass in perf/price
- Next-gen Xbox may hit 4K 60FPS in every game
- Project Scarlett to hit 1080p 120FPS gaming
- Project Scarlett trade-in program announced, but there's a big catch
- New Viking Assassin's Creed may be next-gen console launch game
- Next-gen Xbox may get room-scale VR gaming
- PS5 and Xbox Scarlett will both handle ray tracing differently
- Gears 5 developer says Xbox Scarlett has dedicated ray tracing cores
- GTA 6 on PS5, Project Scarlett to have insane hyper-realistic visuals
- AMD 'Flute': Xbox Scarlett SoC: Zen 2 8C/16T @ 3.2GHz on 7nm
- Project Scarlett's price isn't locked in yet
- Project Scarlett isn't the last Xbox console