New features in PHP 7.0

Scalar type declarations
Return type declarations
Null coalescing operator
Spaceship operator
Constant arrays using define()
Anonymous classes
Unicode codepoint escape syntax
Closure::call()
Filtered unserialize()
IntlChar
Expectations
Group use declarations
Generator Return Expressions
Generator delegation
Integer division with intdiv()
Session options
preg_replace_callback_array()
CSPRNG Functions
list() can always unpack objects implementing ArrayAccess
Class member access on cloning, e.g. (clone $foo)->bar()