I did post about this a while ago in this thread:
Chevy Bolt. 200 mile range for $30k base price - Page 2
I am convinced that this is just a compliance vehicle designed to be manufactured to garner just enough credits so GM does not need to buy them from companies like Tesla. These cars are very likely to be sold at a loss, just to get credits, so the vast GM assets churning out ICE cars are not stranded. There is no way they will be able to touch Tesla battery cost without a similar scale, i.e. gigafactory.
If there is a plan to produce more batteries than for about 20K Volts and about 16K of Bolts, they would surely mentioned it. The reason that they did not speaks volumes.
From my point of view this will not add much to the case for electric cars replacing ICE, because this car is from the get go designed for a different purpose: provide just enough ZEV credits, at a minimum loss to GM, so that they avoid financing R&D of the companies like Tesla.
Don't forget that according to the same WSJ article GM was hoping to sell 60K Volts per year, probably because this was the goal that would get them enough credits. This, obviously did not work so good, and even after the price cut their sales were not even near the set goal (18.8K last year). So they were forced to go back to the drawing board to come up with the Bolt. Once again this will allow GM to get ZEV credits they need, and more fully utilize their battery facility which is now underutilized.