The EV3 internal Bluetooth is just 2.1 so it will never support SBrick or anything else BT 4.0-based.
However... LEGO designed the EV3 in a quite open way.
It is possible to add BT 4.0 hardware in several ways, the easiest is using an USB BT 4.0 dongle but there are some SPI/UART/I2C to BT4.0 adapters (don't know any real case).
It is also necessary that the operating system running on the EV3 understands this new hardware and until this moment the only one that I know is ev3dev. But it is possible that RobotC, LeJOS or even LEGO itself include support for it.
It is also possible that a company like Mindsensors or HiTechnic start selling a I2C to BT4.0 adapter with a native driver for RobotC or NXT2/EV3.
if you intend to use SBrick with EV3 in less than 6 months your better/only option is ev3dev.
