Well, FF 3.1 (or 3.5, whatever) will have an improved tabbing system, including the ability to drag tabs out of the window to create new windows, etc, but they will still lack the inherent feature that, IMO, makes Chrome a real innovator: per-tab processes. That's really the single-biggest feature that I would love to see in Firefox.
If not for a few must-have plugins that keep me coming back to Firefox, and of course the lack of Linux support, I would have switched to Chrome the moment it came out on that single feature alone.
