From the k2 site in March this year...
"K2 v3 development has re-ignited and is on a steady track for a realistic release date by late April 2016, especially now that K2 v2.7.0 is also released (a requirement to upgrade to K2 v3.0.0).
Yes, you read correctly. Within a month's time, we'll make every effort to finalize all remaining issues and release K2 v3 :) "
Any update on when, as we slip into July? Having learned a bit about K2 from another project, I am interested in seeing V3 to see if it addresses some issues I have with the current version before choosing what to base the new site on.