It is probably the discovery of additional earth-sized extrasolar planets in TRAPPIST-1's Goldilocks Zone[0].
It would be really cool though, if at least one of those planets turns out to have an oxygen atmosphere...
The inclusion of Sarah Seager[1] an exoplanet scientist working on the problem of identifying the signatures of life in exoplanet atmospheres[2], is suggestive.
[1] http://www.saraseager.com/
[2] http://www.space.com/28756-alien-life-search-exoplanet-atmos...