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Skype for Business just went GA

here are the announcements:
https://www.thurrott.com/cloud/office-365/2889/skype-for-business-is-now-generally-available
http://products.office.com/en-US/skype-for-business

If you have Office 365 AND you have enabled First Release you should get it once you prompt for update in office.

To update Office open e.g. Word and go backstage

backstage

Then click there. Wait for a bit and at next reboot you will have Skype for Business.
for me it took about 10 mins.

update office