The current state of the 3 HB site is that it is still an active #7 subway extension construction site, "Site P":
Site P is in foreground, looking NW from the south side of 34th St & East Hudson Blvd. Tall crane is on site of future 3 HB, right (east) side of Site P is the future Hudson Blvd park bracketed by E & W Hudson Blvd, with a parking garage underneath. Grayish building is NOT on 3 HB site, it's the subway vent building at Site K, between 35th & 36th St.
The MTA committee's November report lists Site P's Forecast completion as Apr 2016, which probably ties into a forecast completion date for 3 HB. The Site P line item also footnotes
"tt The scope of work in the Secondary Station Entrance Core & Shell and Building Systems/Finishes (Site P) contract package is not required for revenue service." As opposed to the primary entrance (adjacent to 55 HY, most of budget spent) only $15.3M of of the Current Contract's $84.1M has been spent.
http://www.mta.info/mta/news/books/p...s.pdf#page=276
Site P's secondary station entrance is probably what the stairs in this render are leading down to: