It would be naïve to think that most of the migration hasn’t already been planned and set to occur shortly after the public announcement. I’m sure this entire buyout and migration has been in the works for at least several weeks/months, as Sun had apparently made a large purchase of STEEM around January 20th...which kind of doesn’t make sense if they’re migrating everything.
What we’ll likely see is all of the previously hosted content published via Steemit.com moved to the TRON chain, where that TRON content will be viewable on the new SteemiTron.com interface (pretty sure it won’t be called that).
Regarding the other comments about continuing the current Steem chain but forking out the STINC/TRON stake...
I would support that.
That was my first thought, then I realized Steemit Inc has been tasked partially with handling the migration. Yeah, it's going to take several years to move everything... The token swap is imminent though.