By now many of you might be already aware of this. However i came across this POWER OBJECTS blog and it seemed to be a very good quick overview of the new CRM 2015 features that are about to come soon. Want just an overview without a great deep dive into each topic? Well this is the link for you.
Hence sharing in case someone finds this useful.
https://www.powerobjects.com/blog/2014/09/16/top-10-new-features-dynamics-crm-2015/
Hope this helps!