Their materials have been updated slightly:
http://ucitysquare.com/inc/overview.pdf
The new version is the first I've seen to mention a delivery date for "One UCity Square." They give it a 2018 delivery date on Page 7. That same page also calls out 3400 and 3800, projects that've been on the table for awhile, but interesting to see them give some sort of prioritization to the buildout beyond 3675.