Actually, it's not that unusual... I've had that done to me a few times in the past when my requalifying milestone has been reached relatively close to the expiry date. If I requalify far earlier than the expiry date for my Diamond CX gives me double Asia Miles on all my flights till my current Diamond year runs out, which is nice of them. I must say that CX seem very generous with their Asia Miles - I recently got a letter from the Club Service Centre telling me that as their "records indicate you have been frequently selected to complete our inflight surveys... we would like to thank you for taking the time to do this by crediting your account with 15000 Asia Miles." Although it's not a lot, it's still nice to see that they appreciate that filling out those surveys a few times can get boring pretty quick...