Yes, but they're mostly constrained in libraries and there's a way to publish them so both 2.13 and 3 can consume them. You can expect "core" ecosystem libraries to be cross-published and most others don't depend on macros.

Note that most things you'd need macros for in 2.13 have language support in 3, so for user code - if that even uses macros at all - the upgrade path is fairly straightforward.