According to what I've read you won't be able to use regular Fastpass if you register for Facepass+.
FastPass+
The ability to pre-plan specific times to enjoy attractions is called FastPass+, currently on its third round of testing at Walt Disney World, which first began in May 2012. With the launch of the new My Disney Experience site, Disney has revealed details of how the FastPass+ system will work when (soon?) made fully available.
Disneys official description of FastPass+ reads:
Once available, Disney FastPass+ service allows you to select an arrival window to experience certain park attractions, character meet and greets, and quick-service restaurants, and to arrange a viewing location for certain entertainment such as fireworks, parades and shows.
By planning a trip to the parks ahead of time, guests will have the opportunity to schedule times to take part in a variety of attractions. Disney notes the availability of FastPass+ times and access depends on a variety of factors, including the theme park you are visiting, the attraction or entertainment experience, the time of year and the day of the week, and prior demand.
Much like Disneys existing FastPass system, each guest will need their own access to attractions by way of FastPass+. But planning ahead will no longer require running around the park with a handful of tickets, individually inserting them into machines, hoping for a good return time.
Instead, new radio frequency-equipped cards will link to attraction reservations made online prior to arriving at the park. A simple tap against a Mickey head-marked post will make the connection and offer preassigned access, such as the one installed at Peter Pans Flight and The Haunted Mansion in the Magic Kingdom shown below.
Though the My Disney Experience site, guests may manage groups of friends and family members, setting up FastPass+ selections for entire parties at once. The number of FastPass+ reservations available to each guest is limited, spanning across an entire group.
In addition to reserving ride and show times, FastPass+ will also allow assistance with dining, by allowing guests to order a meal prior to arriving, simply selecting the time at which theyll want to eat.
According to the rules posted on the new site, FastPass+ selections will be available for one park per day, available for each attraction, entertainment or restaurant experience just once per day as well. That is, for example, guests cannot pre-book multiple trips aboard Space Mountain, though are certainly free to join the Standby line as many times as they want once in the park.
FastPass+ reservations may be changed online up to the point when the first is redeemed or expires for the day. Unredeemed FastPass+ experiences can be changed throughout the day, so guests who want to stay flexible while in the parks can simply skip a time they chose and go online via a mobile device to make modifications to the itinerary if needed.
Guests purchasing Magic Your Way tickets can begin planning FastPass+ times 60 days prior to using the ticket. The selection window for other ticket styles, including annual passes, is yet to be determined.
Existing ticket holders, including annual passholders, wanting to participate in FastPass+ will be able to convert paper tickets to a paperless variety, via My Disney Experience. A new RF-equipped ticket will replace the old, allowing access to all of the newly-enhanced planning opportunities. The old FastPass system will no longer be accessible for those who switch to the paperless option. Likewise, old paper tickets will no longer work for theme park admission, requiring the new tickets to enter.
Annual passholders will need to hang onto their paper pass, for now, to verify passholder benefits, such as merchandise discounts.
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