The amount of bytes you receive will be proportional to the total balance of this Bitcoin address on December 25.
I assume this'll be the same bot which will be used for the real Bitcoin address linking, however seing "December 25" for the testnet linking is a bit confusing, one may think that the testing phase extends to December 25 whereas, if I'm not mistaken, it is supposed to end by the end of November.
Thanks, fixed to November 30 to avoid confusion.