Usually a press conference is used to push some position or agenda. Hard news from the Pres usually comes in the form of of a statement from the oval office. So I'm not expecting much.
I did find this Google reference to the Rose Garden (if that is in fact where the press conf. will be), although I was unable to click through to the link cited:
[PDF] The Office of CommunicationsFile Format: PDF/Adobe Acrobat
Rose Garden is used for quickly assembled events featuring the White House as a backdrop,. as it takes a relatively short period of time to bring in the ...
www.blackwell-synergy.com/doi/abs/10.1111/j.0000-0000.2001.00190.x - Similar pages
Just came over the radio that the Ohio congressman (Jack someone or another?) has pleaded guilty to the charges he was facing.
I wonder if maybe he gave somebody up and it could be related to this news conference?