Teva’s thrice-weekly Copaxone will be reviewed under an NDA. If approved, it could cannibalize some of the market for regular Copaxone, including the generic versions; however, thrice-weekly Copaxone will require an explicit prescription and won’t be substitutable for an Rx written for regular Copaxone.
I don't have an answer for the question in your second paragraph.
The thrice-weekly Copaxone formulation (GALA study) is not low volume, rather it's a stronger dose (40mg glatiramer acetate instead of 20mg). The low volume formulation tested in the SONG study got a CRL from the FDA back in Dec. 2010.