Erpnext Version 13

Are There Any Problems with erpnext version 13 ?
And What is the difference between Erpnext Version 12 & Erpnext Version 13 ?

Version 13 is still in the beta phase and is being actively developed. Version 12 is stable, only receiving bug fixes.

There are many many changes between the two versions. You can find them in the release notes, for example here:

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Thank you so much

is there a rough plan when v13 shall be ready for production?