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I'm not curious enough to try and download the beta, but I am curious about one thing: how did they implement expiration date checking? Is it based on the system clock or does the OS connect to Microsoft server to check what the date is? If the former, it will be possible to use the beta indefinitely. (Not that you would particularly want to, but it may be possible...)
I remember installing QNX in this way. The free developer version came with a key that expired a month or so after acquiring it, but if you set the system clock from the BIOS to any date before that, you could still install it. After installation, you would simply set the date to the current date and voila.