Why all the taxiway construction at PHL? Perusing Google Earth around Philadelphia, I noticed some new taxiway construction at PHL/KPHL.  The "time machine" feature of GE shows this to be new (latest imagery data is May 2016)--the paved areas in the red circle below don't appear in past aerial imagery.

What are all these paved areas for?  Are they extending 10R/27L?


From Google Earth

Note:  The Google Maps image for this area shows an older aerial image (without all that extra concrete).
From the KPHL website


  Realign Taxiway H and Establish Taxiway EE (North)    
  
  This is the first phase of a multi-phased project to provide a 1,494
  linear-foot extension of Runway 9R-27L, construction of associated
  eastside taxiways and hold pads.  In this phase a new Taxiway EE will
  establish a connection between Taxiways H and K and Taxiway H will be
  realigned between Taxiway EE and the existing Taxiway D.
  
  Projected completion date: August 2016


As well as,


  9R-27L Extension - Site Prep, Utility, &amp; Fuel Line Relocation    
  
  This is the first phase of a multi-phased project to provide a 1,494
  linear-foot extension of Runway 9R-27L, construction of associated
  eastside taxiways and hold pads.  In this phase a new Taxiway EE will
  establish a connection between Taxiways H and K and Taxiway H will be
  realigned between Taxiway EE and the existing Taxiway D.
  
  Projected completion date: October 2016


The imagery predates the projected completion dates so it makes sense.