SC:G Is either going to be released on next gen with another 5 yers for development, or isn't going to come out at all. With a book already being releasedd based on the story, the entire project could be scrapped completely, and keep the story which is what happened when Warcraft Adventures was scrapped.
Also, WCIII ladder system is not only better, but it kicks the shit out of ANY online service for any PC game on the market. SC ;ladder system is broken, and outdated. Blizzard even had to throw in some of the Bnet feature from wCIII to make SC a little less disgusting.
If SCG is released, it will likely use an online system, hopefully similar to WCIII.
P.S. If no one wants to be a mod here, I'll do it.