I agree, I believe that DIAdem is one of the most important programs in the NI software suite to upgrade to 64-bit.
After all, many of us are producing large measurement files and it would be a pity to have to use MATLAB only beacuse of the lack of memory supported in DIAdem.
The DIAdem (2014) 64bit Beta program started on Oct. 9, 2014!
To participate, please go to www.ni.com/beta and select "DIAdem 2014 64bit" in the "Request Participation in Beta Program" enumeration control, then click the <Submit> button.
Shortly thereafter you will receive an email from NI enabling you to go to the Beta web site and download the installer and other documents.
DIAdem 2015 will release with both a 32-bit and a 64-bit version.