I'll write that I've yet to see this work in SD cards. SD cards were already pretty fast compared to MMC or older CF cards.
The write time is some milliseconds (10's of or less) so yes it could be faster, but image compression time seems to be far longer than the write time.
I've heard that some cameras won't use or take advantage of the high-speed SD cards. I want to speed up my Panasonic DMC FZ10 camera recovery when shooting actions-- sports and wildlife . Will these new cards help me improve the performance of this camera?