Where on the coast? The official coverage map seems to lag several months (longer in some cases) behind deployments. We have other sources that do show coverage in areas that the official map does not. However the MS Coast right now does not show any new coverage, so it was probably recently added.
Drove from Washington heights to midtown and every clear site I hit now has 3XCA live.
Network is performing awesome from 181st to 28st(most of Manhattan, I didn't travel any more South to confirm)
Here are speed test taken from Clear sites in midtown running 3XCA..
*Bonus, just asked a buddy of mine from Brooklyn to check for Clear 3xCA since it's his home site, lo and behold 3XCA it's live on that site too! Bringing me to the conclusion that it's probably deployed extensively in BK as well.