Mousemonkey :
http://www.guru3d.com/news-story/nvidia-to-launch-geforce-gtx-880-in-september.html
The heck, if that 3DMark score is true, then 880 is actually meh :/
Makes sense, since it's still 28nm process and with downgraded bandwidth compared to 780s... It has slightly more shaders than 780Ti, but much less ROPs and TMUs, almost half the bandwidth, but more calculating power.
It's basically about 780Ti not that exciting IMO.