So it seems that service and amenities will be similar to Polaris Business.
I tried a demo seat at the WTM show in London (November 2018)
LHR based FA was explaining the product:
Meal: Full tray "like in Business"
Foot rest
Little flap on tray for tablet etc.
Aisle seat's arm rest lowers to allow exiting the seat while the tray is open.
Larger screen for bulkead/exit row seats
Better bedding