The good news is that it appears that applications exported from Early Adopter Phase 1 import ok in the new EA2.
The bad news is that plugins have had a bit of an overhaul. It looks like the PL/SQL code used to construct a plugin now uses functions rather than procedures. So back to the drawing board for some of my online store demo plugins!
Can anyone from the team shed some light on what I do with 'apex_plugin.t_page_item_render_result' or 'apex_plugin.t_page_item_validation_result', please?