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A BW Beta wouldn't reveal that much, considering by then they had already started testing and selecting what to keep and what to ditch before injecting it in the actual game file.
This is why the DP Beta wasn't THAT interesting compared to Spaceworld Gold.
I'd be more curious for a proper Ruby/Sapphire leaked beta/demo, that one would probably hide a lot more secrets in its data than its Black/White counterpart.