Now there are 12 artifacts, including 3 new ones (the bottom row)! I found all 12, and here is the first picture of them.
I was a little disappointed that the new ones weren't more powerful (similar to most of the others). And it is still questionable whether it is worth spending the money to search for artifacts.
The new "Planetary Organic AI" artifact is probably the most valuable of the new artifacts as it boosts tax income by 10%, and speeds up population growth rates (by 20%, see it highlighted in bottom right corner).
Overall, I believe that the Data Archive artifact, which lowers research costs by 25%, is still by far the most valuable artifact.