As shown, the structure will get copied from flash to RAM at device reset time. But don't forget that an Arduino has a lot more RAM (1k) than a BS1 has EEPROM (256 bytes, shared with the program itself.) You can PROBABLY fit any script that fits in a BS1 in Arduino RAM without having to worry about the more exotic memory technologies.
This discussion has drifted from the original Wiki announcement; I think we should move any more discussion of DATA/READ/etc functionality, or "script players" to A thread in the Software/Development area