The full list can be found at the link below. Note that the summary states 517 cards but a few were not implemented eg. Agricultural Labourer. I think the number is around 512.
After a full month of testing and very few bug reports, we are very pleased to announce that the new set of cards will now get out of alpha !
Again, we want to thank Acerbic for his great work, bringing 300 more cards for you to play.
The complete list can be found here : https://tinyurl.com/agricolaBGA
(there are several tabs, cards online are the one "approved" in the doc)
The timing was too short to add them to current Arena season, but they will likely be added to the next one, and probably a bigger change of gameoptions is expected to happen at that time.
As usual, please report any bugs you might encounter using the bug/suggestion BGA system.
Have fun playing !
Tisaac, Vincentt & Acerbic