DCA B / C Connector?

[Dont call me Shirley]

There was thread some time back that discussed the possility of a connector between the B and C concourses at DCA.  IIRC, there was some disagreement between US and MWAA about how it would work and look.  And, of course, costs.  Does anyone know is there has been progress?  

 

[ChockJockey]

Washington airports operator plans $1bn investment in National
 
"The capital programme includes a new regional concourse connected to the north pier, connecting the three terminal B/C piers inside security by relocating security checkpoints to level three from level two, a new car park and planning for renovations of terminal A, says Margaret McKeough, chief operating officer of the Metropolitan Washington Airports Authority (MWAA), at a board meeting today."
 
Also:
 

MWAA board okays agreement for new construction at DCA
 
Airports Authority Board Approves Use and Lease Agreement for Airlines; Addresses Reagan / Dulles Imbalance
 
It sounds like it's still very much in the planning stages, but it's progress of a kind.