You can already do it if your phone is plugged in and charging.
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Apple also lets you answer incoming callsā??hands-freeā??by saying ā??Hey Siriā? when the phone is being charged or plugged into power. If you use the ā??Hey Siriā? function to place an outbound call, though, you have to manually switch it over to speakerphone. Obviously not very effective for an eyes-free, hands-free interaction.
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If you have a Jailbreak, you can get a tweak that allows you to do the "hey Siri" command anytime, anywhere...plugged in or not. I believe there's a tweak or ability baked right into the phone to make speakerphone answer the default.