This was the last official reply that I can find on this, almost a year ago. It would sure be nice to allow the community to help by supplying icons you may need, in the format needed. Then you could just apply new ones as they come in with future releases and updates. Or have an online repository that is checked, or whatever makes sense. Another option would be to make all the logo images white, and allow the back ground color to be changed, so that if you have multiple Twitter or Wordpress logins, as examples, you could visually and more easily differentiate between them. So, hopefully, there will be an update to this request. At least let us know where it is in the stream of things.
I'm sure I'm not alone in offering my assistance in helping to bring this to fruition.