First and only I3 sofar. Any others pls share I3 specific info and links.

From this site:
"Haplogroup I was also found in Scythian remains in Siberia (I4 subclade) and in southern Russia (I3 subclade)."
"I3 is found mostly in countries with high percentages of R1b in northwestern Europe, and its presence in the Unetice culture and among ancient Scythians confirm an Indo-European origin"

The only thing 23andme added was I3 forked about 8.5k ybp.