So far - that we know of:
SI CE3's which will not require a syringe to fill, and also a larger version with more
juice capacity to better handle our X2's, not to mention colored versions.
In October, hopefully, new American made juices will be introduced.
There are even more colors in the X2 coming - there will be all the colors just like for the regular
batteries (only half of the colors available now).
They've said they do not plan to expand into variable volt or other
mods and are concentrating more on their current 808 lineup.