Ok, saw some guys on stream talking in chinese about Barbarian’s Savagery skill. Streamer was a level 112 Barbarian and they sound like they know what they’re talking about. They have been translating Korean sites.
Savagery works on Stab attacks. Apparently the only weapons that have Stab as their auto-attacks are Spears.
Unfortunately, if you take Barbarian, you can’t take Hoplite as they’re both rank 3 so that currently only leaves Cataphract as the other way to wield Spears. Otherwise hopefully there will be advanced spear wielding hidden classes later on.
Also, the attribute “Savagery: Slash repeat” is only obtainable at Barbarian circle 3 so I guess this is reserved for advanced classes.
The attribute “Savagery: Critical occurrence” only boosts crit rate of Savagery by 15% at max (should be pretty obvious).
Hoplite’s Finestra skill still takes the cake - boosts crit rate by 39% at max level.
The attack types Slash, Stab, Pierce, Hit are VERY important in this game. Using the right and wrong types of attack on a particular enemy can mean the difference between doing ~70 damage and doing ~200 damage. That’s why people on streams change weapons sometimes. If you see Swordies with hammer + shield, this is why.
Disclaimer: The above is just from a conversation, may still be inaccurate. Don’t take it as official or anything.
Hope this helps with your planning.
P.S. They also mention during the CBT skills are tweaked on a constant basis if not on a daily basis and they keep changing, so bear that in mind

