Yes, if you have the money you can now pick up SSDs of 4TB or larger, but you will be paying a premium.  Novachips uses HLNAND to acheive this density, a technology that The SSD Review describes as being similar to Thunderbolt in that it daisy-chains together flash memory to allow high access speeds even when the storage medium is stacked this high.  Novachips uses a proprietary NVS3800 controller which is ARM-based and provides eight channels.  Check out the full review to see these drives in action but before you get too excited the MSRP of these drives is going to be about $0.65/GB.

"Novachips has just introduced the worlds largest capacity notebook SSDs through its development of HLNAND and The SSD Review has the exclusive first review of both. Their Scalar 4/8TB SSDs are the first single controller 2.5" SSDs of these volumes, and both have top tier SATA 3 speedsa along with a low heat and power draw."

Here are some more Storage reviews from around the web:

Storage