It has eight short stories in it, and is only available from Smashwords and its distribution partners (basically, everyone except Amazon). I’ve updated it already when The Perihelix came out, mainly to add an offer coupon in the back of it.
The benefit of changing the edition rather than putting out a new book is that people with the current version can upgrade free of charge. It’s my way of giving fans some of the additional stories on their reading devices (although to be fair, they’ll have already been on this website or Jemima’s blog).
So if you want to keep up to date, read the current version you’ve already downloaded – or download the current version in the format of your choice from Smashwords. The new edition will be coming very soon!
At the moment the Sampler is on free sale – but that’s never guaranteed.