If the funders are really serious about creating a Reality TV experience about volunteers taking a one way trip to Mars then this is the only way they can do it at this time:
1. They will publicly do exactly what they have been doing so far, all the while screening the applicants for those most likely to buy in to what they are being told.
2. Once they have the final applicants sequestered and completely removed from the public and communication with the outside world they may or may not give hints to the public about what is really going to happen:
What will really happen:
The "Winners" will be totally isolated from communication with the public with the exception of very carefully screened media and family communications etc.
They will be constantly filmed documentary style, which they already expect.
After the Training "Season" and drama they will be boarded onto what is described to them as a top secret craft built by the Russians or whoever and carefully told that space travel technology is actually far advanced of what the public has been told and that they will be Pioneers in space exploration.
They will actually be entering an expensive yet economically viable simulated ship (ala Ascension http://en.wikipedia.org/wiki/A... where they will then spend a number of months "traveling" to Mars with cameras in every room.
After that season they will have a dramatic yet fright-filled arrival and landing at Mars. I assume at this point that they will pull a Capricorn One in some desert. ( http://en.wikipedia.org/wiki/C... ).
At some point, as each person dies for some reason, the truth will be revealed to each one and we will have the Drama of them having their 'Second Chance' at life.
-- If done successfully and done right I would actually watch this drama. So everyone, please, shush! Don't tell those final 100 anything!