1) All the languages supported by the current version should also be in the new version.
2) This version is a 64-bit application that runs natively in macOS. There are no tricks to make it run in a 64-bit environment.
3) We don't know what the patch level will be, if there even is one. For the pack selector and switching languages, we'll find out soon enough.
If you have more questions, you can ask here:
https://forums.thesims.com/en_US/discussion/982933/64-bit-sims-3-for-macos-is-coming-soon-for-real
We'll be trying to answer questions as they come up as well as posting other useful information.
