What will it take to upgrade a 4 to a 5?

I have a Taz4 and love it, but really like the increased temps of the 5. Will there be an upgrade path from 4 to 5?

They already sell a toolhead with the Taz 5 setup. That’s the biggest change.

https://www.lulzbot.com/products/lulzbot-taz-single-extruder-tool-head-v2

And the PEI bed… though if you have the 4, I’d just buy a sheet of PEI from Amazon.

Cool, and I’ve already done the pei upgrade. Is the entire extruder redesigned, or just the nozzle? Can the nozzle and fan be bought and the new extruder printed?