This is the TWC MAXX upgrade first announced back in January. So far only Costa Mesa and West Hollywood have been upgraded officially I think, although there are other areas coming online little by little.
Claim in the announcement is "complete for all of LA by end of the year", so there is an ongoing rolling upgrade process.
"The network and Internet speed upgrades will soon come to the LA areas of Covina, Cypress, Hoover, Crenshaw District and Jefferson Park, and to upper Manhattan and additional neighborhoods in Queens and Staten Island in New York City. By the end of June, TWC will be delivering the new, faster speed plans to more than 200,000 customers." There are many millions of broadband subscribers in LA and NY, so planned delivery of the MAXX upgrade to 200,000 by end-of-June (per the April press release, not per reality) is not a very rapid rollout.
Anyway, there's nothing we can do but wait. It's ongoing, and will eventually arrive.
As has been discussed before, this delay just provides more time to think about whether or not to eventually retain Turbo or Extreme service tiers for their additional $10 or $20 over standard speeds... which will newly be 50Mb/s with MAXX instead of current 15Mb/s, and will be much faster than current Extreme (30Mb/s) for that $20 premium. So go back to Standard (which can get by with the 4-channel modem I already have), get 50Mb/s instead of current 30Mb/s with Extreme, and save $20/month by not having Extreme (which will change to Ultimate 200 with MAXX for the same $20 premium over Standard, but which will require a new 16-channel modem purchased or rented).