Arthur and Molly Weasley are exclusive to the upcoming LEGO Harry Potter set 4840, The Burrow. This will be the first time this lovely couple has been available in minifigure form.
Minifigure Parts and Accessories
Both Weasleys are straight forward figures with four parts each: a hair piece, head, torso, and legs.
The hair pieces have both been available on previous figures. The missus hair was most notably featured on the minifig for Mary Jane Watson from the Spider-Man theme (part x220) in dark orange. Arthur's coif is also in a dark orange color and seen on various minifigures like Agent Fuse (part 62810).
Both heads feature new prints and bring yet another design to the senior citizen collection of wrinkled minifigure heads.
The torso prints are also new. Mrs. Weasley's design combined with the torso print to provide the look of a rather full and well used apron. Mr. Weasley's torso looks great with the coat/sweater/tie combo. Mr. Weasley's legs are just standard greys with no additional print.
As with many of the minifigures wizards in this line, the accessory is a grey 4L bar (part 30374) standing in for Arthur's wand. Mrs. W does not appear to come with any accessories.
Overall these figures capture the spirit, if not the exact appearance, of the Weasley's based on their film appearances.
Army Building Potential
I can't imagine either one of these figures being sought after in multiples. I'm calling the ABP for both figures as "low".
The draw of these figures is to help fill out a LEGO Harry Potter minfig collection. Aside from this, there's not much.
(Pictures via Eurobricks and Harry Potter Wiki)