According to insider sources, Nvidia's desktop GPU team is already testing GTX 11xx prototype PCBs and the final specs should be announced in mid-July. One of these prototype PCBs was already leaked on reddit. The board does not feature the GPU, however the spec sheet includes 12 GB of GDDR6 VRAM with a 384-bit bus, three 8-pin power connectors and a second gen NVLink.
https://www.notebookcheck.net/First-Nvidia-GTX-1180-PCB-prototype-leaked-with-12-GB-384-bit-GDDR6-VRAM.311656.0.html