The Lexar 1TB microSDXC card is still a prototype which means we have no idea what the cost would be, but when released this would offer some very impressive features.  As an A2 or Class 10 card, it offers a minimum of 4000IOPS random read, 2000IOPS minimum random write and at least 10MB/s sequential.  With a compatible device it is also UHS rated as well as able to match the newest Video Class of a minimum 30MB/s.  The 1TB of storage will offer you around 17,000 hours of music, more than half a million pictures or about 80 days of recorded video, all in this tiny card you can see below. 

The SSD Review had a chance to test out this prototype, which you can see here.

"Great relationships can lead to great things. In the past few months, there have been a few companies who have stated their intention to market the holy grail of portable storage; a 1TB microSDXC card."

Here are some more Storage reviews from around the web: