Will I need Eth for crowdsale or can I buy in with BTC too?
The crowdsale will be mainly in the form of ETH. If users only have BTC, a shapeshift opportunity will be available. The ETH will be stored in a multisig client and will be publicly visible for people to check balance.
Why use shapeshit? It charges a lot, I prefer poloniex, cheap and good liquidity, easy to buy eth.