As others have said, the hotspot is just another way of tethering (in 4.3, they've basically renamed Internet Tethering to Personal Hotspot and added WiFi as a means to connect, along with the original Bluetooth and USB), and will be dealt with in exactly the same way as tethering currently is.
What this means is that if you currently have tethering enabled (rather than the Setup Internet Tethering button under General Settings), you'll get Personal Hotspot when 4.3 is released and if you don't, you won't