1) There might not be a conversion, and if there isn't I think it will be due to the commons not being worth converting to. I believe the commons have much more downside risk than the juniors. 2) If there is a conversion it will have to be at a premium to the market (and also a premium to par because I expect the juniors I own to mostly trade above par if divs are restored). In my estimation I will own far more common shares later by owning the juniors now, compared to selling my juniors now and buying commons with the proceeds.
The Fifth Circuit en banc majority, by a 9-7 vote, decided that the NWS is ultra vires and thus 4617(f) does not bar them from reviewing it. They reversed Judge Atlas's dismissal of the case on 4617(f) grounds and remanded it back to her. This is the APA claim side of the case.
The Ninth and Eleventh circuit merits panels decided the opposite, that the NWS was not ultra vires and thus 4617(f) prevented them from reviewing it. Circuit splits are a common reason for the Supreme Court to take a case, and I believe that was the impetus this time. This case is actually Yellen v Collins, because the defendants (government) are the ones who appealed this part of the en banc panel's ruling.
Collins v Yellen involves the Collins plaintiffs appealing the other en banc majority's 9-7 decision (involving a different subset of judges) to not grant any backward relief when curing the constitutional defect of FHFA's structure as an independent agency with a single director not removable at will by the President.