Thanks to the Spellplague and the Second Sundering the city of Neverwinter has gone through massive changes since the previous editions. Thus much of the information about it, that was valid in earlier editions, now truly is history.
What official WotC source(s) contain accounts, maps, and/or descriptions regarding the current state (5th ed, ~1489DR) of Neverwinter?
Best Answer
The main source of current information about Neverwinter comes from the Sword Coast Adventurer's Guide Chapter 2 under the heading of the same name in the section "The Lords' Alliance" (p. 51-53). It contains a reasonably detailed history and current status as well as a couple of maps (one being a partial world map and one of the city itself).
There is also a small amount of information in Storm King's Thunder here (p. 101), but most of it is also in the above reference and there is no map. The city is even more briefly described and mentioned in Princes of the Apocalypse here (p. 35-36) also with no map.
Note: I have refrained from quoting any of the material since you are asking simply about where it can be found and not any specific information about the city, and it would not be allowed or ethical to quote all the material here.