I saw this, and was wondering, is there a way to find out who they are in advance?

There are also Framed Mini Printing Plates (1/1) and Hobby-only Cloth (#/10) cards. The Mini Metal (3 copies - Hobby only) and new Mini Stained Glass (25 copies) options cap the list at 150 subjects.

Amazing how much these have gone up since last year, due to your crypto card, in my opinion:

https://www.ebay.com/itm/2019-Topps-Allen-Ginter-Baseball-Hobby-Box-24-Packs-Box-8-Cards-Pk-3-Hits/392310436173?hash=item5b5786314d:g:Eq4AAOSwz4Zc-qsa