News was in the air since the LIGO discovery, but the 11th LISA symposium in Zürich made it official: after its dropout in 2011, NASA is ready to rejoin ESA in the effort to build the first gravitational-wave observatory on space. The effect of this dropout was not only to change the mission's name (from the original "LISA" to "eLISA") but also to drastically reduce its budget, resulting in a smaller apparatus and reduced science case.
The recent GW discovery has boosted this field and, after the announcement in February, it was immediately clear that the plan was to anticipate eLISA flight (initially tentatively scheduled around 2034). Now, it seems that eLISA could fly some years earlier (around 2030) and, most importantly, it will probably be build in its original LISA design, thanks to the joint effort of ESA and NASA.
After the LIGO/Virgo discovery, after the amazing success of the LISA Pathfinder, this is yet another great news for gravitational physics and science in general. Year 2016 will definitely be remembered as marking the birth of a new discipline.