I am the happy owner of a X-E2s by accident. I wanted to buy a used demo E2 as companion for my E1 and T1 from a shop at Ebay. Before they shipped it they found it was broken and in the end I got a X-E2s.
When I tried to open a RAW with the current version of Photo Ninja, version 1.3.1, the software crashed.
The files can be opened and processed if the 's' of the second occurence of the string Fujifiilm X-E2s is replaced by the value zero (not the character '0'). You need a Hex Editor for this.
I know fiddling around with a Hex Editor is not for everyone and doing this for hundreds of RAW files is only doable if your Hex Editor is supporting batch processing. Mine does not. But for a first test this may be helpful.
Let's hope that PictureCode include support for the E2s soon.
Edit:
Disclaimer: I did not make extensive tests. So make a copy of your RAW files before you patch them on your own risk!