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Since purchasing a 2.5g mdx and knowing the risks of it being an oil burner, I have taken notice of the black soot that collects at the end of the exhaust tips. Every 2.5G I have seen has it, but its does vary. Its also not as prominent on the round 2g tailpipes. Is that because of the design change or the extra oil burning?

Every engine will smoke at some point (even if its almost not visible) and every exhaust has carbon in it. But is the extra soot on 2.5g tailpipes linked to the extra oil burning that some of these have?
 

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Nope, Soot is perfectly normal on any Car.
Water is a byproduct of gasoline combustion, So the black soot is just water mixed with carbon in exhaust pipe. Water usually comes out when engine is not hot enough like when starting it. So the liquid water drips out of exhaust with the carbon mixed in it making it black. But after driving a little the engine becomes hot and so thus the water and it comes out as steam. So you don't need to worry.
 
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