Curiosity or there's something you can't do with TM1?
Improved completions (complete from project, etc), not crashing when editing remote files (e.g. when using MacFusion), project-wide commands (Validate Syntax for project, Transliterate to ASCII for project, etc), split pane editing, more intuitive way to edit bundles & language grammars directly in textmate (using "Edit in TextMate..." is a bit hacky), Javascript & other improvements in the web preview (such as refresh on save and instant CSS preview), improved code formatting/reindent, multiline regex engine, among others.
However those are only things I *know* I want. I'm actually more excited by all the features I don't know I need yet. :) Anything that makes TextMate more TextMate-y (such as more powerful snippets, commands, and grammars) is fine by me.
Thanks Allan and sorry for flooding your list with useless messages...it's just that our curiosity and excitement are constantly peaking and it just takes one errant comment to get us all aflutter. :)
Brandon