Read an interview a while ago where Blizz spokes person confirmed that it will be priced as an expansion and not full game - roughly around $35, so I'm not sure what that will translate to in Rands. I'd expect R250- R300
I wouldn't really say Blizzard uses always on DRM - and even if they do, the quality of Battle Net makes up for it. Sure, they can be annoying in terms of not releasing LAN support and ignoring the needs of the competitive community, but they've made a really awesome game and are pretty sharp on balance, so I forgive them :P
To me games are still expesive, but if you watch the video of how they make the game and money they put in developing a game. It's well worth it if it is a decent game^^