Tiger has only been out for about six weeks, so it wouldn't be a good idea to muddy the waters for users and developers by focusing on the next release. This is even more true with upcoming support for Intel-based Macs.

This year is about going deep on all the new stuff in Tiger (there's plenty of material to work with), Xcode 2.1 and preparing for Intel. Next's years conference will almost certainly focus on Leopoard.

Tiger already runs just fine on Intel, so there will be much more to Leopard than that