They are compatible with all models of Raspberry Pi (including the original, which they’ve mis-labelled the ‘A’) and come in a variety of form-factors. These look like well thought-out boards, and well worth a look. Pledges start at a not-unreasonable $19 for the GSM/GPRS board rising to $99 for a 4G board, which again isn’t that bad if you can afford it.
They’ve already started making tutorials for the boards, which proves that they do at least work and there’s a fair amount of support behind them.
Worldwide shipping is included (bravo, guys) and the campaign runs until 17th December seeking to raise $50k. I’ve made a pledge for one of the super earlybird GPRS/GSM shields, just as a punt.
Take a look at the campaign video below or go to Kickstarter here.