McDonald's in Japan has recently re-released the Mega Teriyaki Burger, a Big Mac-esque burger first released in 2007 whose patties are seasoned with teriyaki sauce. But the patties aren't regular beef patties; they're sausage patties, according to this review from The Adventures of Fatrick, who recommends that only teriyaki-lovers try this burger since "No other flavor manages to wriggle out of this doused mess." See more photos at gigazine.net.
Eataku points out that the Mega Teriyaki comes on the heels of MOS Burger's limited time release of their Umakara Teriyaki Burger, a revamped version of their famous teriyaki burger seasoned with spicy Korean gochujang, black pepper, and garlic.
Also from MOS Burger is their new B.L.T. for 490 yen ($6) featuring natural (no pesticides or chemical fertilizers) domestic bacon, lettuce, and tomatoes, with or without cheese. You can also just get an L.T. for 430 yen ($5.30), but then you'd be missing out on the most appealing part of having a super long slab of bacon hang out of your burger. Once again, gigazine.net has a review with more photos.