I know about 320gb 1.8", but my reply was to your post about 2.5"
SDXC standart only allows memory cards with capacity up to 2TB. It doesn't mean that there will be 2TB in size of an SD card immediately as the standart adopted; the only thing it means is that there could be cards with capacity more than 32GB (previous standart didn't allowed it) and that there never will be SDXC cards with capacity more than 2TB.
Look at this from such a point: in 2002, HDDs were close in size to 128GB, and old standart (LBA28) didn't allowed HDDs larger than 128GB, so new standart LBA48 was introduced. It allowed HDDs with capacity up to 128 petabytes (that is about 131072TB). 8 years has passed since that standart was adopted; and nobody thought that maximum practical capacity of HDDs is only limited by standart, and that 128 petabytes HDDs will appear within a couple of years from adopting a new standart.
Realistically, flash memory capacity doubles in the same volume about every 1.5 years (except for the last couple of years due to economic recession), so you shouldn't expect 2TB memory cards until 2018 or so. Maybe later, but unlikely sooner.