I would call the number and ask them. The deal requires a one year contract extension, so if you are already eligible to upgrade to smartphones, it might be best to do it all at the same time. Just my opinion.
i did not have to do a contract extension, i asked about the specifically. they said you can change you plan anytime you want while under a contract.
ok, so i my current one ends in march, so maybe thats it
as to waiting or doing it now. IF you are 100% sure you will get smart phones do it now. it may not be here for long. it was orriginally very limited, but it has been opened up some
one guy on android forums did get turned down