So we need to buy BTCD to join this ICO?
You can invest with both BTC and BTCD.
Right now you are better off investing with BTCD as the price is below 0.00425 (the first day BTC price with bonus applied).
Likewise BTCD also comes with other benefits like an average bonus boost and more.
The OP says the BTCD swap will be dealt with after the ICO, but gives no details. How will the process work?
Will the BTCD swappers get their new coins at exactly the same time the bitcoin investors get theirs?