Dare Obsanjo has some strong statements about XML 1.1:

XML is a lousy format for most of the things it is used for. The one benefit it has is that it is widely supported and a guaranteed way to interoperate in a cross-platform manner. By tampering with this the W3C is effectively diluting one of the few benefits of using XML. This is an regrettable occurence. Unfortunately it looks like things will get worse now that the W3C also wants to dabble in “binary XML”.

I wholeheartedly agree with the statement about binary XML, and strongly suspect he is right about the rest as well …