Implications of moving from COQL v2 to v3

Implications of moving from COQL v2 to v3

I am new to COQL and because my initial searches in the Zoho support docs brought me to info on using v2, I did not realize I had an option. Are there any REAL benefits to changing from v2 to v3 and, if so, what are the implications to all the code I've currently written? For example:
1. Will new Scopes need to be set up?
2. Will I need to publish new Access and Refresh tokens?
3. What will change in my COQL query statements?

Anything else I should consider?

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