One is correct
Last year, I had one extended into April. I asked about more and they said no. I do not know how it will work in 2012. UA/CO is trying to shorten the period you have for usage by giving upgrades to you when you hit the 1K mark, rather than at the end of the year.
This one could go either way for 2012, but if I had to guess, I would think that they would follow the one upgrade into April.