I think we can safely say this is definitely happening: both sides have spent way too much money in legal fees alone to wimp out now, and Hasbro clearly want (rather unedifyingly in their desperation) a DC/Marvel/Star Wars-style mega-franchise, which D&D rather uniquely fits.
Don't get me wrong, I'm not hopeful of the end product being any good, but we are going to see a big-budget movie based on an RPG hitting the screen, which is kind of crazy. In fact, if Hasbro were bonkers enough to help raise $220 million for the Battleship film, I wonder what they're going to bet on a movie based on something that has actual stories attached to it. It'd be rather insulting if it was much less.
Oh, I totally think it's definitely happening, my point was that I have been SEVERELY disappointed by the production values of every single D&D based movie (yes, that includes Mazes & Monsters, starring Oscar winner Tom Hanks) thus far.
. . . I remain hopeful. Willfully hopeful!