This seems like the appropriate spot for this:
An interesting twist for S30 would be for them to have a 'double' season, but to not let either group know there was another group until they got to the 'second' merge point. So 32/36 people 8/9 per 'tribe', 'merge' A/B and C/D at 9 remaining (to make them think it's a 7 person jury/2 person finale). When each group hits the 'final 4' then merge them into a single tribe with all the jury members now united as well. Final tribal could then be either 3 or 4 members with 12/13 jury.
We talked about something similar at work a while back, but we couldn't see how the logistics would work out.
Each show would have to air two immunity challenges (which means no reward challenges, and without reward challenges or reward/immunity challenges, contestans would get suspicious), plus they'd have to air the goings on at 4 full sized camps, and two tribal councils each show.
Also, merging each group at the "final 4" wouldn't be fair. You'd be asking the jury to vote on one out of four contestants to win, when they know absolutely nothing about two of them. Or, what happens if the real finalists all come from one side? Then you're asking for jury members to vote for someone that they have never met, or seen play at all.
Now, what we decided could work would be to do it up until the merge. At the merge, Jeff tells tribe A and B, "drop your buffs, you are merged." and tosses them a bag of buffs. They start putting them on, and realize that there are way too many. They ask why, and Jeff yells, "come on in guys..." and tribes C and D walk in, looking just as confused. Jeff explains that all 4 tribes (who knew nothing of each other) are merged into one tribe.