downloadable fonts in FF 3.1 - better for MathML?

I saw something and, before I get too excited about it, I thought I 
would check with others.

On the Firefox 3.1 Developer page, I see:

   http://developer.mozilla.org/en/Firefox_3.1_for_developers:

   # @font-face allows sites to link to downloadable fonts
     so that Firefox may render sites more precisely as
     intended (including being able to display Unicode
     characters not otherwise supported).

So, if I understand this, it may be possible to be _sure_ that one could 
display some bit of MathML on this version of Firefox. Obviously there 
will be resource management issues, and I expect there will be things to 
write bugs about, but this does change the game, yes?

So, I'm excited. I think.

We may be able to get away from requiring font downloads to use MathML, 
yes? No?

cheers - ray