The thing about Mars is that it has all the right ingredients for life, but the catalyst (water) is frozen or underground. There is plenty of evidence that water existed on Mars once (canyons that have clearly been etched out by water, etc...) and so I believe it is totally plausible that life once existed there.
But I think with the atmosphere being a near vacuum (600Pa to Earths 100,000Pa) and the lack of surface water that it is unlikely we will find life. Perhaps you may find archaeological evidence for life frozen in the soil, or life may still exist underground, but we may never know within our lifetime I'm afraid.
Also Mars's methane is like 10PpB, it's an incredibly small amount, especially seeing as the Martian atmosphere is so thin. If it does point to life, then it doesn't point to much life I would imagine.
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