LabVEIW 7 offers several additional features that were not in previous versions. You can still use every Express VI, except for the one DAQ-Assistent.vi. However, I have been told that we are planning on supporting all of our key devices (including the 6534 with-in about a year). We will have several releases of NI-DAQ in this time and each release will include the support for additional hardware. So keep an eye on our web site for new versions of NI-DAQ to support your 6534.
I hope this helps.
Joshua