I think it’s fairly self-evident what “kind” of items they will be… they’re called “pro packs”. Packs featuring signature yoyos. The sale page also has the Champions Collection logo, so I suspect they will be signature throws that are part of that collection. Since the 3rd wave is coming in, probably clearing out the 2nd wave.
Since it’s a “pack”, probably some strings, maybe an extra bearing (Spec X?), and to fit the “pro” theme, extra response pads either red “pro” pads, variety pack, or whatever that player prefers. Add a YYF tool and some stickers, and you have a “pack”!
Not saying that’s exactly what will be there, just that the concept isn’t really a mystery. It’s going to be something like this.
The mystery part will be: “Which player will be featured today?” and if they have multiple signature throws, “Which yoyo is in the pack?” Finally, the REAL reason to tune in is: “What will the price be?” Be interesting to see if 3A packs have two yoyos…!