Does 2E Cornucopia/Guilds have recommended kingdoms with Alchemy? If so, are they effectively subdivided into Alchemy/Cornucopia and Alchemy/Guilds kingdoms (the way 2E Prosperity and Seaside did it)? And does it have recommended kingdoms using Cornucopia/Guilds alone? If so, do they have 5 cards each from Cornucopia and Guilds? Are there any all-Cornucopia or all-Guilds recommended kingdoms?
If we got A/C, A/G, and C/G, then I think we would at last have recommended kingdoms for all current pairings! And if we didn't get any all-Cornucopia or all-Guilds sets, that means we probably aren't getting an all-Alchemy kingdom (since those are/were all small sets), which would mean we may also have completed the set of recommended kingdoms for the currently released sets!
These are all the relevant sets:
Guilds & Cornucopia:
Misfortune: Advisor, Candlestick Maker, Doctor, Fairgrounds, Farming Village, Fortune Teller, Horse Traders, Jester, Soothsayer, Taxman
Baking Contest: Baker, Farming Village, Harvest, Herald, Journeyman, Masterpiece, Menagerie, Remake, Stonemason, Tournament
Guilds / Cornucopia & Alchemy:
Clown College: Jester, Remake, Harvest, Horse Traders, Menagerie • University, Golem, Alchemist, Philosopher's Stone, Familiar
Wine & Dine: Young Witch, Hamlet, Hunting Party, Fairgrounds, Horn of Plenty • Apprentice, Scrying Pool, Apothecary, Transmute, Vineyard • Bane: Herbalist
Illuminati: Butcher, Herald, Masterpiece, Merchant Guild, Stonemason • Apprentice, Golem, Philosopher's Stone, Scrying Pool, University
Tonics & Toxins: Baker, Candlestick Maker, Doctor, Plaza, Soothsayer • Alchemist, Familiar, Herbalist, Transmute, Vineyard
There is no all-Alchemy kingdom. If you want one, I think, everything but Possession and Scrying Pool.