For whatever it's worth, this would certainly seem to indicate that Joey Crawford and Mike Callahan have Game 4; I literally have no idea who the 3rd might be for that game.
I'm very curious about a couple of things associated with the way the referees are assigned for the rest of this series.
1. For the last two years, the Finals alternates all worked Finals games at some point during the series; in 2011, the alternates for the first 4 games didn't work any Finals games at all. If the league is sticking with 12 officials for this round, it's hard to come up with a likely 12th official (given the assumption that Joey and Callahan will be the 10th and 11th) other than one of the 3 alternates so far -- John Goble, Ed Malloy, Bill Kennedy (maybe Tom Washington, who did work 2 games in the conference finals). It's interesting to me that unless the league is expanding the pool of Finals officials, either Kennedy or Malloy (or perhaps both) won't call these Finals. (it's a good kind of interesting, since I'm not really sure why either has been a Finals official in prior years).
2. In the past, with the 2-3-2 format, the league could use a fairly simple pattern to assign officials to Finals games, which kept the general rule about limiting the number of instances in which an official would work multiple games in the same series in the same city. It has long been true that the Game 5 officials are (almost always) some combination of the Game 1 and Game 2 crews and that the Game 6 officials are some combination of the Games 2-4 crews and that the Game 7 officials have been the Game 3 and Game 4 crew chiefs along with a third (in both 2010 and 2013, the Game 7 crew was the Game 1 chief, the Game 3 chief, and the Game 4 chief):
Game 1 (@MIA) McCutchen, Brothers, Phillips
Game 2 (@MIA) J. Crawford, Malloy, Mauer
Game 3 (@SA) D. Crawford, Capers, Davis
Game 4 (@SA) Foster, Callahan, Kennedy
Game 5 (@SA) McCutchen (Gm. 1), Brothers (Gm. 1), Malloy (Gm. 2)
Game 6 (@MIA) J. Crawford (Gm. 2), Callahan (Gm. 4), Mauer (Gm. 2)
Game 7 (@MIA) D. Crawford (Gm. 3), Foster (Gm. 4), McCutchen (Gms. 1 & 5)
With that rotation, only McCutchen, Joey, and Mauer worked more than one game in Miami and nobody worked twice in SA. (this logic basically applied in 2010, which was the last prior instance of a 7 game Finals).
This year, with the 2-2-1-1-1 format, if you use the same logic, you end up with almost everyone who works multiple games working each of those games in the same city. Thus, if history holds and the Game 5 crew will be either the entire Game 1 crew or some combination of Games 1 & 2, then you end up with an entire crew (likely Foster, Mauer, and Capers) that will have worked 2 games in SA and the Game 6 crew (should it be necessary) will most likely be a crew that will have worked almost exclusively in Miami. I'm not sure if the league will see that as a big deal or not; in theory, it's not a big deal at all (and the league will undoubtedly say that its officials call the games the same without regard to which gym they happen to be in), but if you end up with a big-time homer on the road twice, that could potentially be an issue.