I did get some good stuff from Club Nintendo over the years, Donkey Konga 2 (complete with Bongos!) for the Gamecube and the Super Mario Characters Figurine:
Overall, it seemed like Nintendo.co.uk never had a big enough budget to provide many interesting things for the stars catalogue. When something decent came along it went pretty fast and all you were left to choose from were wallpapers and ringtones to spend your soon to expire stars on.
Right now they are offering Mario themed christmas wrapping paper for 2000 stars...that's 8 games worth of stars for some paper
So I'd would like to be optimistic about whatever they do in September, but these are the same people that ran Club Nintendo the way they did for the past decade and it never really improved, even with the big relaunch of the site last year.