7860-7870 was Corona's first test set which was OOS for two years. 7371-7915-7380, as you mentioned, did test with CBTC in some way but was never taken OOS. Some other sets tested OOS too, like 7491-7927-7500 which is currently OOS now.
Back onto the topic of the R179s, yes they can get CBTC at a later date and probably will when needed. No, they will not have CBTC right away as they will most likely run on the and . Nothing is definite and I am not saying these assignments are set in stone, but the most logical place to put the 179s would be these routes.
Any updates on 3015-3019's delivery?