Professional opinion: if you want to see a Superman movie sooner than 2020, I'd consider starting to watch Smallville, or at least the TV movie. Why? Here's a little known fact:
WBTV (Warner Bros. Television) is treated as a separate company to Warner Bros. Pictures (the movie production arm), and despite sharing resources such as studio space and staff, both are treated as separate entities. This is because WBTV was originally considered a failure, and Time Warner wanted to ensure it could be sold at any time without hassle.
As such, WBTV has to pay a licensing fee -- as if it was a third-party studio like FOX or Disney -- for the rights to Superman and the DC Universe, which is pays to both the movie studio and DC Comics. This license fee is how the show's able to "selectively steal" copyrighted material from the movies and comics without landing in trouble.
Anyway, the point is this: WBTV pays for the outright rights to Superman and the DC Universe. That includes television (which it gives to The CW Network), DVD/Blu-ray (which is gives to Warner Bros. Home Video), merchandise and publishing (which it gives to Titan Books), and most importantly, movie rights (which WBTV appear to have kept for themselves, or in-partnership with The CW).
And because this long-term continuing deal was made prior to the lawsuit, regardless of whoever ends up with the rights to the Superman franchise, the deal has to be upheld, because WBTV is officially a separate, self-sufficient company that made a legally binding contract for the Superman I.P.
So, if you want a Superman movie sooner rather than later, and don't want to wait for Warner Bros. Pictures (who seem to want to "ride" the lawsuit out until the Heirs give in and sell their rights), then WBTV/CW is your only choice. If WBTV/CW want to make a Smallville movie, whether it be theatrical, for TV or on DVD, they are legally allowed to do it. They've already proven they have this power with 'Absolute Justice'.
And as WBTV/CW would be the producers, and Warner Bros. Pictures only the distributors, the Heirs have no legal rights to intervene either. (The lawsuit only considers future deals WB makes regarding production, not distribution.)