Rob's mystery WhatNot book

For the last month or so Rob's been teasing that he has a new WhatNot exclusive book supposedly coming out the end of January/the beginning of February. I'm trying to guess what it is. Here's what I've got so far.

Heirborn issue 1: a full sized version of Heirborn. This would make sense as he's been teasing it for a while now.

Badrock issue 1: it's certainly possible. The book only requires letting since the art was finished a while ago.

Keith Giffen's Doom's IV: Rob announcing this in his Giffen memorial episode a while back. Apparently Giffen had finished pencilling a full issue of a Doom's IV revival. I asked for an update months ago and Rob said it was still being inked. So many it's finally gonna see the light of day.

Giant-sized issue 2: Rob announced that Giant-sized Youngblood was only the first issue in a four part story. So perhaps part two is done.

Youngblood: Bloodsport issue 2 complete version: a man can hope.

If anyone has hears any clues as to what it's gonna be on his livestreams or one of his many social medias that I missed let me know. This has me so curious.