Doesn't NEED Javascript!
For everyone getting het up about the existence of Java in this exploit, that is just an example of how it could be released into the wild. (If you can decrypt SSL, then you can probably add extra text into the connection to include your java)
BUT I don't think you need it.
I suspect you just need a packet sniffer and the code and away you go.
So, for example, sit in a public place with a dodgy wifi AP and everyone surfs through you thinking "haha, I'm safe, I've got a green padlock". In the meantime you've captured all their login/password information etc. Presumably you can decrypt it all at your leisure and then login to their paypal/bank account a few days or weeks later and pay yourself a little bonus.
If it takes java 10 minutes to decrypt, then a bit of nicely written OpenCL with a pile of GPUs will probably crack it realtime. That's something I'd like to see! (not on my connection)