I downloaded the Windows .exe file.  It ran on my Windows 7 system, but when it came across the Trezor wallet file that had been working with a build of an earlier version, it choked.  So I removed the Trezor wallet file and restarted the .exe.  This time it gave me the "create wallet" dialog, but this dialog did not include a decision box for "hardware wallet"  which the earlier build did have. So apparently this beta .exe file does not include Trezor support.

I tried running this same beta on a windows 8.1 tablet. This tablet had previously been running Electrum 1.9.8 and it had a suitable configuration file and a wallet that had been created on 1.9.8. When I started the beta .exe I got a Runtime Error R6034, "An application has made an attempt to load the C runtime library incorrectly."  After dismissing this warning, the beta did come up and show the balance.

Unfortunately, the old 1.9.8 installation was now broken on this machine. To get it running it was necessary to delete the default wallet and recover it from seed.