What makes you say that it's chances of supporting life are minimal?
Perhaps it is my inner pessimist, but even if the planet is the perfect mass, has an atmosphere, and is within the HZ of it's star - that does not automatically mean it will support advanced biological life (by advanced, I don't mean technological, just multicellular). There are a lot of factors that go into life arising on a planetary surface, and while I don't think the environment has to be exactly Earth-like to support abiogenesis, there are still other nuances that are involved in organic life forming which are not purely addressed by the mass and orbital properties of the planet. I
do think we can detect life on a exoplanet with the upcoming missions we have planned. However, it would be foolish to say that the exoplanet automatically has life on it because of its similar physical properties to Earth. Overall, the chances of any one exoplanet having life seem minimal when all factors are taken into consideration.
I would like to make it clear that I am not really talking about the Rare Earth Hypothesis here, but rather talking about the challenges life seems to face as it gains a foothold on a planet.
This discovery of the Earth-analog candidate is really exciting though, and further proof that at least in basic physical properties, Earth is not that rare in the cosmos.