This just showed up on the FAQ page of the Firenzecard:
http://firenzecard.it/index.php?option=com_content&view=article&id=20&Itemid=119&lang=en
Do I need to make reservations for the Uffizi and Accademia Gallery with Firenzecard?
"Yes, you need. To enjoy the priority access a free reservation is required. You can make reservation with your name and surname:
1) calling the multilingual call center Firenze Musei to phone number + 39 055-294883 (from 8.30 to 18.30 from Monday to Friday; from 8.30 to 12.30 on Saturday). Closed Sunday and holidays
2) in Florence at one of the following ticket offices: Orsanmichele (Orsanmichele Church, Via dei Calzaiuoli, from Monday to Saturday 9.00-16.15; Closed Sunday and holidays); My Accademia (via Ricasoli n.105/r, from Tuesday to Sunday 8.15-17.30; Closed Monday); Uffizi (door n.2 and n.3, from Tuesday to Sunday 8.15-18.05; Closed Monday).
In case of phone reservation, you have to collect your booking confirmation at one of the ticket offices listed above, using the code received by phone, and to show it, with your Firenzecard, at the priority access doors of the museums.
If you buy Firenzecard at the ticket offices of Uffizi Gallery, Bargello National Museum, Palazzo Pitti, you can make directly the reservation at the ticket office at the moment of purchase and collect the booking confirmation to show at the priority access doors of the museums ."
This info does not yet appear on the Uffizi's website, and the info above isn't as clear as it could be. Requirement for reservations to the Accademia was published a few weeks ago. This is an expensive pass to begin with and, IMHO, flexibility was a significant part of the value. Without that benefit for the top 2 of Florence's paid attractions + difficulty getting an open time slot for the duomo's dome with the card once one is IN Florence, I don't know as it's worth € 85.00.