Sounds like a great scheme. Makes it easy for everyone to keep track and control of what they eat. Nice.
You mention lower fat options, yep, but I'll like to add that the fats to avoid are the Saturated fats - keep that to an absolute minimum. They are bad fats. But the good fats, the unsaturated ones are actually an essential part of a healthy diet. Such as nuts (particularly walnuts) and fish (omega). So when you say lower fats I hope you mean just low saturated fats
. As for anything with hydrogenated Oil - avoid like the plague!
So I guess WW doesnt include any exercise plans? Hope you are nevertheless complementing the WW with some effective exercise plans or jogs and fast walks? If you find yourself at a plateau further down the line (ie slow progress in losing weight, despite exercising and healthy dieting) then thats when you need to change your diet to other foods, and also your exercise plans to kick start your fat burning metabolism again. May I offer a couple tips to raising your metabolism along the way.
1. Spread your meals into 5 meals (breakfast, mid morning, lunch, mid-afternoon, dinner)
2. Interval Training. Ie. when doing cardio (wether it be walks, running, cross trainer etc) do short bursts of intense cardio (so say 5mins training zone, 30 sec high intensity, then back to lower intensity, repeat cycle). Racket sports such as badminton are great fat burning activities.
I was looking at last years holiday photos yesterday and I was absolutely horrified by how big I was, I think at the time I was in denial and didn't realise how big I was!! At least I know this years will be much better 
