Hello Kate! Good news...when the dining window was expanded to 180 days, so were the park calendars. Park calendars are currently posted through May, 2010.
As far as character meal suggestions, since you have three boys, you may not be interested in the Princess dining but there are others your boys may enjoy such as Chef Mickey's (very popular), Donald's Safari Breakfast or 'Ohana's Best Friend Breakfast with Lilo & Stitch.
You can read about all the character dining options on the
restaurants page on disneyworld.com. On the left side of the page, you'll notice there are filters you can use. Filter on "Dining Experience" and then "Character Dining" to see a list of all your available options.
Happy Planning and check in with us if you have further questions! Diane :)