This is just a prediction, so please take this with a grain of salt.
Robin
1st skill - Bleed damage + regen(2nd skill moved to 1st)
2nd skill - Increase crit damage(4th skill moved to 2nd)
3rd skill - Same
4th skill - Deal penetration damage and reduce enemy healing and regen to 0%
5th skill - Same
Metis
1st skill - Penetration damage(upgraded from current 1st skill)
2nd skill - Bleed damage that remains until deactivation
3rd skill - Same
4th skill - Penetration bleed damage that stops enemy from attacking
5th skill - Same
Robin
1st skill - Bleed damage + regen(2nd skill moved to 1st)
2nd skill - Increase crit damage(4th skill moved to 2nd)
3rd skill - Same
4th skill - Deal penetration damage and reduce enemy healing and regen to 0%
5th skill - Same
Metis
1st skill - Penetration damage(upgraded from current 1st skill)
2nd skill - Bleed damage that remains until deactivation
3rd skill - Same
4th skill - Penetration bleed damage that stops enemy from attacking
5th skill - Same