I hope BTC direct investment in the ICO will be an option.
the reserve currency that they hold for BANCOR is ETH so you have to be carefull on the details, when they will anounce it, because is posible to only be available for eth.
Does that mean we can only participate using ETH?
That should, and probably would, be the case unless they worked out a deal with shapeshift or one of the others. But i don't think it would matter in the case of Bancor because they are, currently, the hottest show in town and their ICO is going to skyrocket - meaning that whoever is interested in investing in Bancor have already allocated ETH and/or will do so as soon as the ICO details are out.