I feel sorry for Karpeles - he'll be walking into a lion's den at the conference. It looks to me like BC Foundation trying to do a hostile takeover on Mt Gox. Gavin is staying mute, Ver claims he knew nothing, the others are silent. Rubbish, they've been planning all of this for months!
An interesting hypothetical.
If I were Karpeles (in this situation assuming it model reality) I'd be sending a message from Japan along the lines of "Suck my big liquidity stick." I'm guessing that other source of liquidity have developed at this point, but Marks taps into the distributed and un-savy pool which is still probably where the richest BTC ore is to be found. Not only does Mt. Gox have this advantage, but also a certain amount of isolation from the direct influence of the US regulatory millstones. I'd guess he probably has the upper hand were all-out war to break out.
For my part, I had been looking forward to working through Coinlab (if/when I needed to in order to dump some BTC.) I now would prefer Mt. Gox though I'll be keenly interested as the gaps in our (us plebs) understanding of what's going down get filled in.