HDMI Cables and HDMI Ethernet?

[Oxide™]

My AV setup is over a decade old now but still going strong

TV = Panasonic Viera TH-42PZ80
Satellite = SkyHD (hdmi 1.4)
Amp = Denon AVR-1909 (hdmi 1.3a)
Console = PS4 (hdmi 1.4)
Speakers = Quad Lite 5.1

Everything still works great but in case the TV goes I've been researching what next to get/keeping up with current technologies (hopefully it doesn't as baby arrives soon)

The new TV I'm currently interested in (Panasonic OLED FZ802) supports HDMI 2.0, which leads me to some questions:

1 - Would I also need to upgrade the amp to one that supports hdmi 2.0?
2 - Would I need to upgrade my current hdmi cables to support the increased bandwidth necessary for hdmi 2.0? i.e. to Ultra High Speed HDMI Cable (48G Cable)
3 - If the SkyHD box had an ethernet cable plugged in, could the PS4 and TV get its network connectivity from its HDMI (hdmi over ethernet) via the amp? I ask because this could free up some ports on my router

 

[Oxide™]

Thanks for the info guys - If I had to get the TV I'd be watching Netflix premium from the TV app so I take it a new amp/cables isn't needed in that scenario

 

[Oxide™]

Thanks lucid - currently the TV is hooked up to the amp via HDMI but gets its sound via SkyHD (Dolby Digtal 5.1 iirc) also hooked up to the amp via HDMI.

My computer (GTX 970) is also hooked up to the TV via the amp using HDMI and it streams LPCM. The amp supports Dolby TrueHD & DTS-HD Master Audio

 

[Oxide™]

I have a spare optical so that's good - thanks for all the info to keep in mind if that day comes