Well, the first thing is that Xojo for 64-bit is in early testing and only available for limited group of people. That group luckily includes the XDC 2015 attendees.
Did you attend the last the conference in Austin, Texas?
Than you should go to Xojo forum and see if you find the postings about the 2015r3 version with 64-bit for testing. Everyone else waits for beta test to start.
For the plug-in, I can say that we should be ready when beta test starts. Not all features work already, but some do and we need to test things over time.