Gigaleak III? 2.5? 2.1?...oh please dear god
September 2, 2020

Stuff leaked:
Wii Startup Disc
Pokemon Emerald source code including Windows development tools
Some cancelled GameCube dock
MIDI files for Gen 3
Project “Tako” / “Vegas” (part of the Wii hardware) development repository backup from May 2006
Information about Vegas:
So the Wii was developed across several companies. These companies would have sent files to each other as a method of cooperating during the creation of the product. Nintendo, obviously, did a lot of the work. BroadOn developed IOS with IBM developing the CPU and ATI developing parts of the hardware. 

The BroadOn and ATI trees have now leaked - the BroadOn tree (containing full dev history of IOS) leaked on May 1 and the ATI tree leaked today (September 2). 

ATI tree includes:
Files relating to the Wii’s hardware from 2003 to May 23, 2006
Pre-release versions of boot0 and boot1
GameCube stuff
“NNGC Portable Model” block diagram from July 2004
NDEV1 and NDEV2 schematics
Vegas schematics
Broadway Evaluation Board schematics
Wiimote stuff?
Full Wii GPU Verilog