Their probably still working on it,after all the b373 was designed first and foremost to be an anti aircraft sam system not an abm system,it would also depend on how serious they want to get with b373s abm capabilities,are they going to have a dedicated abm missile like the patriots pac3 or will they go for dedicated missiles and specialised abm radars like the s300vm/sa23 or will they just keep it simple and use the standard b373 sam,the simple fact is we still dont know,hell we havent even seen the b373 sam being test fired yet.