There are currently no plans for flighted tournaments (I guess this is what they're called).
If your tournament is just multi-day, it would seem to me that there's no support really needed - you just save the tournament, then load it up the next day and continue where you left off.
But for multiple flights on the same day (or at the same level, I guess) that merge at the next day/level, what type of usage and support would be needed?
I really don't know much about managing this type of structure, but I would think the functionality would be fairly simple:
1) Start a tournament as usual; add and buy-in players in this "flight". Run the tournament.
2) At the end of the day/flight, "end" the flight. There's no winner or chop. There would simply need to be an "End flight" feature that marks the flight as "done".
3) A feature that allows a new tournament to be created by selecting one or more previously ended flights. This would pull in the players from those flights with their current status (history from the previous flight(s), current chip count, etc; obviously already bought-in).
Given that's all I know about it, what else would there need to be?