RE: when do you think that update with the map integration will be rolled out?
Well, hard to say and to be very frank. That is a feature that I have on my to do list for years now because there are a lot of under the hood things that I needed to implement before coding it the way I want it to work. Those pieces are starting to come together.
One itm that will come first is a generic map block for the new WP page/page editor. Nothing fancy, just a map with a pin. Like others already available. The purpose it will serve me is to become even more familiar with the new blocks system as a dev and to help further flesh out the new map API in Connections. After that I want to create another map block that will allow one to pick an entry or perhaps a category of entries to display on a map. Much closer to what you’re asking for.
RE: is it possible to change the dropped pin icon to something else?
There is no user way to change the map pin at this time. The underlining map API does support it however. My hope at some point will be to allow the user to define custom map pins.
Hope I have answered your questions thoroughly!