Existing 3rd party software migration Did Apple mention/provide a way to upgrade existing 3rd party software once systems with the new CPU are released or are we expected to buy from scratch? Does anyone remember how they handled this during transition to Intel?
Two notable differences between 'old' Rosetta and 'new' Rosetta are:

Rosetta 2 will 'pre-compile' its translation before the app is launched. The old Rosetta would 'translate' PPC code to Intel anew each time the app was executed.

PPC CPUs were 'Big-endian' (the order in which multi-byte words were stored), whereas Intel and ARM chips are both 'little-endian'. That removes one of the major headaches and causes of problems in translation.