To soon to tell for sure as Yosemite is still in beta if Handoff services will work with older systems with 3rd party hardware.
The next issue is the WiFi antenna in your system is limited so you won't get the throughput 802.11ac could offer.
As for Bluetooth 4.0 services alone here you will need a USB dongle.
Don't forget, not all of the older systems will be able to support Yosemite.