An exciting news, Dynamics CRM 2015 is released earlier than it’s expected. The download links for On-Premise is available now: https://www.microsoft.com/en-us/newsearch/DownloadsDrillInResults.aspx?q=crm+2015&cateorder=2_5_1&site

As well as the new CRM Online trial instances are provisioned as Dynamics CRM 2015. http://www.microsoft.com/en-au/dynamics/crm-free-trial-overview.aspx

To get started with the adoption and training for Dynamics CRM 2015, Microsoft Dynamics content team has put a good resource: http://www.microsoft.com/en-us/dynamics/crm-customer-center/training-adoption-kit-for-microsoft-dynamics-crm.aspx

Plus this Curah! links from Donna Edwards that really summarised the available content on the net: https://curah.microsoft.com/211516/crm-2015-helpful-resources