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I pessimistically predict that they (maybe not Phoenix, but maybe something else) will find some bacteria very similar to earth forms, which will launch a never-ending debate as to whether they were Martian forms that seeded earth, vice versa, some extra-solar sytem source that seeded both, or simply earth contamination that was brought to Mars by probes. After many years of fruitless debate, most will lean toward the last explanation but without the question ever being settled.
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If it has a different origin from earth life it will be freaky different. For example there is no chance it will have earth type DNA. It is possible that mars life originated from freaky different earth life that has sinced died out on earth, but I think most people would be satisfied that freaky different life probably didn't originate on earth.