Many people hope so, however it hasn't actually happened yet
At the moment, it's not clear, but I'm sure that they'll be back. It has been confirmed this week that Michael Weatherly (Tony) and Cote de Pablo (Ziva) will both be back for next season (7)
Season 4, Tony dates Dr Jeanne Benoit
probaly yes
Ziva's boyfriend, Michael Rivkin was killed by Tony. Tony and Ziva will both be back for season 7
season five, the same season were jenny shepard, director of ncis, dies.
Nobody knows at this point, it is all speculation.
We won't find out until the next season :) Can't wait though :D
Season 4, Tony dates Dr Jeanne Benoit
No
yes
He doesn't. Tony does, however, contract the pneumonic plague in the 23rd episode of season two.
probaly yes
Ziva's boyfriend, Michael Rivkin was killed by Tony. Tony and Ziva will both be back for season 7
season five, the same season were jenny shepard, director of ncis, dies.
We don't know yet because season 7 has not yet begun
He was 32 in the 1st season, so now he's 39.
Nobody knows at this point, it is all speculation.
Boxed In Season 2