One of those sources is...the actual contract-- which is a public document.
It's called a specific performance clause, and is the exact thing twitter says it intended to sue to enforce.
Delaware chancery court, where this will be litigated, is not that kind of court.
There's no jury, and they tend to move very fast by legal standards because they ONLY hear these types of corporate cases and aren't years-long backlogged with other junk.
For example in the LVMH case folks like to cite- suit was filed by Tiffany Sept 2020 asking for specific performance of an M&A contract. The court set the trial date for January 2021, less than 4 months later.
If they don't like the result, the only appeal available is to the Delaware Supreme Court, which frequently resolves urgent matters in days, and rarely more than months.
Certainly at any point in this process the two sides could decide on a settlement of some kind... but it's not the kinda thing that can drag on many years.