Well, if you read the small print, the current 0% finance offer is on vehicles listed in the Feb 2006 brochure and the cars have to be registered by 31st March.
In my own experience of buying a new Panda two weeks ago - the discount I got was contingent on registering before 31st March - so that the dealer could get extra bonuses.
It does make me wonder if Fiat are about to announce some model updates and/or specification revisions.
There is already this new "Alessi" model, and some psuedo technological mumbo jumbo about Bluetooth enabling the car and sticking in Windows mobile 2005 etc (God help us....).
I wouldn't be surprised to see Pandas start coming with bluetooth enabled stereos, with audio controls on the steering wheel and with connections for ipods and the like - as an option or as standard.
In addition, checking out Fiat Auto UK's accounts, reveals that March 31st will be the end of their first quarter - so I expect that they are keen to post back to their Italian masters as high sales figures as possible.