Hi the new Xbox will surely have Hdmi 2 and not Hdmi 1
If I need a new monitor then I currently have a TV that has been in use for 5 years
Second
The Xbox will deliver the cables when you get them so the power cable and the HDMI connection
The PS4 Pro already has HDMI 2.0, the XBox One X even 2.1. The new ones will also have 2.1 connections.
Nevertheless, they can also be operated with old HDMI versions. The TV should have HDMI 2.1 for all functions.
Suitable cables are usually included with the consoles.
So new monitors that were built in 2018 & 2019 will surely have one or Hdmi 2. 1
No. The 2.1 chipset is complicated, even with the year-old TV models it is not yet integrated everywhere.
I don't know about monitors, but I assume that only selected models will have them.