R12 includes several new features compared to 11i.5.10 including:
1) Enhanced sub-ledger accounting, multiple reporting currencies, and deferred revenue/COGS matching.
2) Unified inventory architecture and enhanced inventory reports.
3) Enhancements to order management, shipping, warehouse management, and shop floor management including new multi-organization access control.
4) Matured modules but some like e-business tax still have bugs being addressed. Customized integrations will require analysis for architectural changes.