While the present antennas may realize the first gravitational waves detection, it is already clear that realizing the full advantage of this new observing window will necessitate a substantial improvement of their sensitivity.
While there are already plans in USA and Japan for constructing second generation detectors, discussions are taking place in Europe among institutions and groups concerned for setting up the base of a second generation European project.
This new antenna will most probably work at liquid Helium temperature, have larger optics possibly made of new materials, use a very high power laser and possibly be located in deep underground to avoid cosmic and environmental perturbations.