Essential:

• Multiplayer with at least 2 players.
• One civilization (Hellenes) in a balanced state.
• 2-3 maps.
• Enough art to support the maps and civ we choose.
• Non-working features hidden from user interface, non-existent units disabled, etc.

Inessential, but would be nice:

• Easy to use game settings program (beats editing user.cfg).
• Rudimentary matchmaking service supporting NAT punchthrough.
• Hotloading in Atlas.
• Rmgen integrated into game engine.
• Review and update of the profiling and crash reporting tools.
• Sound.
• Some sort of single player sandbox, like maybe a simple "fixed force" scenario where you fight against a static enemy.