Hi,
You are not paying anything for EAD renewal. It says that if you have a pending marriage based I-485, you don't have to pay anything for renewal. I sent my renewal application last month.
And about new biometrics, I just received a notification in the mail saying that they are able to use my 1st biometrics info so I don't have to go through a new one.
If you ask me, I would send the renewal application right away.
And I must say that when I saw the mail in my mailbox, I thought it was my interview notice. I got excited for a second.
