Thanks for all you do, Matt.  Re the ETF basket, a couple considerations:

1.  Next morning is great.  Just would note that for the west coasters and others who have crazy mornings, you would want to avoid winding up in a situation where, even sometimes, the trades don't go out until that morning.  If they all went out in the evening every time, people could count on it.  

2.  If you have or can develop a way to show on the systems page that will contain the trades when the information was last updated, that would help, even if they religiously went out each night at a particular time.   That would limit the questions you get, too.