The coin update announced today is that for bond 7-15 they will be giving out an additional 240 coins on top of the coins you already get for bond levels 7-15. This is to facilitate opening up two new append skills introduced with anni 9, which are crit damage up and a onetime cooldown reduction on each unique skill in a servant's kit so for example if you have a skill with a 7 turn cooldown when you use it it will instead be a 6 turn cooldown, this helps with double Koyanskaya setups.
Edit: Also, we are going to get a new feature with append skills where previously unlocked appends can be locked so a new one can be unlocked with the same level as the locked append.
