As some of yours may already have read somewhere else, the collaboration between Alephtar Games (the editor of Wind on the Steppes) and Chaosium (the owner of the BRP-engine license) has been terminated. As a consequence, the book is not on sale any more neither at Alephtar games nor at Chaosium. It is a pitty, moreover when you consider that Wind on the Steppes has been released a few months ago only and did not get its chance to reach its full public.
I'm not sure about the future of WotS, but I'll do my best for it to be available again in any form, so keep an eye on it. I however don't know today how and when, or even if I'll manage to.
Nevertheless, I'll keep going feeding this blog. If you have any question, contact me using the contact form.
Edit 23.09.2015 : it looks like WotS will probably get a second life, indeed. Praised be Mayin, the Guide of the Dead's Souls ! But it will take time, so you'll have to be patient.