On 27/11/2008, at 8:49 PM, Joseph Wright wrote:

>> Has the code to be
>> re-written to take benefit of new features?
> Not at the moment.  For XeTeX, I'm not sure there would be so much  
> to do
> (port fontspec, basically).  For LuaTeX, my impression is that LaTeX3
> will not use any Lua features in the LaTeX kernel. There is already  
> too
> much work to do to get LaTeX3 finished as it is.

The other side of the story is that LaTeX3 should be as compatible as  
possible using both XeTeX *and* LuaTeX, and their capabilities vary  
quite a bit.

So the aim at the moment is to build a system that relies only on e- 
TeX as a base system -- and we'll see what the future brings :)