The big change is that there's a new WiFi patch. It's basically the IO80211Family.kext from Mojave (Security Update 2020-005), plus AirPortAtheros40.kext from High Sierra (Security Update 2020-005), plus MachInit's change to AirPortAtheros40.kext that adds support for more models of Atheros cards. Tester feedback seems to be that it restores AirDrop and Handoff support on 2012/2013 Macs, and generally improves stability, but it still has some problems. (If it won't connect to networks for you or complains that it can't find networks, try turning WiFi off and back on.) WiFi was broken completely on 2011 iMacs during v0.2.1pre development, but this should be fixed now.
If you need either of the older WiFi patches for any reason, then open patch-kexts.sh in a text editor, go down to line 250 or so, and read the comments for further instructions. You will need to comment out 4 lines of code and uncomment 1 line of code. (It is possible that future patcher releases will add command line options to do this.)
A bug in the new installer trampoline code introduced in v0.2.0 was causing the Installer app to lose its icon. Thanks to iPixelGalaxy for reporting this bug.
A fix was made to patch-kexts.sh and unpatch-kexts.sh to reduce the number of filesystem changes and (eventually) cooperate better with Apple's delta updaters. At least one more fix of a similar nature is needed, but that has been postponed for a future patcher release (probably v0.2.2) because, in my judgment, it was too risky to do at the same time as the WiFi changes.
All of the kexts taken from High Sierra were updated to their Security Update 2020-005 versions (previously they were the 2020-004 versions), and the BCM5701 Ethernet kext taken from Catalina has been updated to the 10.15.7 version (previously it was the 10.15.6 version).
Finally, there have been several small fixes to the README. Thanks to buckrock, n0rt0nthecat, and amaze1499 on the MacRumors Forums for their feedback.