There is basically four HDMI cable:I've been looking at this and it's really tough to get an answer. Here is CNET's take on it
"You should be able to get 4K/60, and a basic 8K/30, with current cables, but the rest will need an Ultra High Speed HDMI cable."
"Game Mode VRR will also work over current cables (between two pieces of 2.1-compatible gear), though if you're trying to push greater-than-4K60 video, you'll need an Ultra High Speed HDMI cable."
I don't think I'm going to need new cables simply because I really doubt we'll be getting anything running beyond 4K and beyond 60fps. Look at previous gens, the target performance doesn't increase, developers just get better at being more performant under those water marks.
Edit: I doubt it will be a 2.1 lead in the box either.
Edit: Techradar are saying it's almost definitely 2.1 though it might be an assumption
As it turns out, the answer is pretty simple: inside the box you get the console, a wireless controller, the base, an HDMI cable that’s almost definitely HDMI 2.1-compliant, plus the power cord, a USB-C-to-USB-A cable to charge the DualSense controller, and the user manual / warranty info.
4Gbps (Standard) - Not on sale anymore.
9Gbps (High Speed) - Not on sale anymore.
18Gbps (Premium) - Support up to 4k30 (or 4k60 with lower HDR)
48Gbps (Ultra) - Support up to 4k120 or 8k60.
Both 18 and 48 GBPs are cheaper and around the same price... the difference the second support HDMI 2.1 specs and the first not.
Here a table with each bandwidth required for each resolution/refreshrate/HDR settling:
PS. The consoles already come with one HDMI 2.1 compatible cable (Ultra) so you don’t need to bother with that.
Edit - I forget the very old standard HDMI cable.