While read and write speeds on the last generation Ultra cards reached up to 30MB/s, in the nex Extreme Micro-SDXC family read speeds have more than doubled to 80MB/s and write speeds have gone up to 50MB/s. What do you need those high speeds for? The most obvious application is for burst shots where your smartphone camera snaps tens of images for fractions of a second.
The new SanDisk cards will come in capacities from 16GB to 64GB and prices are expected to start from $59.99 for the 16 gig model and up to $199 for the 64GB cards.
source: Android Community