Peter Morgan (FROST/NIXON, THE QUEEN) told MI6 [1] that James Bond 23 will be a "shocking story." Morgan has been working on the first draft of the screen play from July until October of this year, but said he couldn't give anyway anything further.
Pre-production has been put on hold until the expected sale of MGM goes through.
Links:
[1] http://www.mi6.co.uk/sections/articles/bond_23_report_dec09.php3