(Are we talking about two different models here? The new crystal model appearing in Europe is transparent white - not green)
Anyway - MCPX v1.1 (wonderful tool Franz) has no problems with the new BIOS [5713], neither has Xbtool (although it's unsupported of course) after the internal RC4 key has been calculated.
My guess is that these new bios revisions pose no problems. I haven't got time to boot them both in a v1.4 just yet - I'm off to a party and then I'm going to watch Formula1 (which is 4am here
so ... tomorrow - if no one beats me to it.