There won't be a TB display, at least there won't be a need to make one. TB can carry DisplayPort, just like it can carry USB, FW, SATA, ethernet, etc.
Maybe I wasn't clear. Current Displays have DisplayPort, but not Thunderbolt. Thus you can't "daisy chain" a display, it must be last in the chain.
Future displays could be TB, which of course includes DisplayPort. Whether this means they can be daisy chained (which seems possible) and whether the same bus could drive multiple displays I'm not sure, but it seems possible. I suppose it's possible that a TB equipped display could offer FW, USB, etc. all carried over the TB bus. But before that happens displays must be redesigned with thunderbolt.
If these things are possible I would suspect we will see TB displays. If not, then no need for anything other than DisplayPort.