Magento have released a statement for all customers on Magento 1.x:
I’d like to directly address some misconceptions we’re hearing about Magento.
Magento stands behind our customers and will never leave a customer behind – you can rest assured that we have your back at every turn. Magento 1 has been and will continue to be supported for the foreseeable future. We have no intention of denying access to our world-class software and know your business relies on Magento to drive growth and differentiation for your brand.
Magento 2 is an outstanding upgrade to a world-class commerce system, and includes capabilities that improve site performance, provide better visibility into business results, and drive differentiated omnichannel commerce experiences. We are confident that every merchant will benefit from moving to Magento 2, and look forward to seeing you upgrade when the time is right for you.
Lastly, we are committing to a minimum 18-month notice before we make any changes to our support levels. If you are not currently receiving communications from Magento, please sign up to receive information on upgrades and announcements.