Q: Will a Macintel run Classic applications? A: No, Classic is dead on Macintel computers and forward
Q: But wait! That means Hypercard is dead! A: Sigh, yes it does.
Q: Will Macintels use Open Firmware or PC like BIOS? A: Macintels do not use Open Firmware. What they do use, I am not sure. There will be system calls to replace Open Firmware to query what hardware is available, etc.