The First Human Mission to Mars in 2018
The press release said the news conference next week would be "detailing its plans to take advantage of a unique window of opportunity to launch an historic journey to Mars and back in 501 days, starting in January 2018. This "Mission for America" will generate new knowledge, experience and momentum for the next great era of space exploration. It is intended to encourage all Americans to believe again, in doing the hard things that make our nation great, while inspiring youth through Science, Technology, Engineering and Mathematics (STEM) education and motivation."
I would add a word of caution here. SpaceRef and other websites are coming to the conclusion that what will be announced will be a manned mission. The press release doesn't sat this, it says:
Since no unmanned mission has been to Mars and back an unmanned mission doing this could be considered historic.
We will find out what is actually being proposed in six days,