nestedcontent_nodename_filter.js

// Filter to take a node id and grab it's name instead
// Usage: {{ pickerAlias | ncNodeName }}

// Cache for node names so we don't make a ton of requests
var ncNodeNameCache = {
	id: "",
	keys: {}
}

angular.module("umbraco.filters").filter("ncNodeName", function (editorState, entityResource) {

	return function(input) {
		
		var currentNode = editorState.getCurrent();

		// Ensure a unique cache per editor instance
		var key = "ncNodeName_" + currentNode.key;
		if (ncNodeNameCache.id != key){
			ncNodeNameCache.id = key;
			ncNodeNameCache.keys = {};
		}

		// See if there is a value in the cache and use that
		if (ncNodeNameCache.keys[input]){
			return ncNodeNameCache.keys[input];
		}

		// No value, so go fetch one 
		// We'll put a temp value in the cache though so we don't 
		// make a load of requests while we wait for a response
		ncNodeNameCache.keys[input] = "Loading...";

		entityResource.getById(input, "Document")
			.then(function(ent) {
				ncNodeNameCache.keys[input] = ent.name;
			});

		// Return the current value for now
		return ncNodeNameCache.keys[input];
	}

});

@mattbrailsford if you add something like this in the beginning, it doesn't stick at "Loading..." if no content node has been selected, but fallback to the default ncNodeName

return function (input) {

        if (input === '') {
            return;
        }

        var currentNode = editorState.getCurrent();
        ...