Two things:
1 - The earliest this will go up is 9 AM PST as will all the other standard orders because that's when SSC opens up, the reason why this will be different than let's say the SDCC orders over the weekend is because it'll be in-stock and they need the Customer Service reps on hand in case things go awry. Not to mention with Superman going up at 10 AM PST, it'll be an interesting morning on the web.
2 - It'll be more expensive than the current commanders. If the last was $130 I can expect it to be $140 plush shipping. SDCC Exclusives usually carried a $10 more price tag than the standards for Non-Attendees and I expect that to be tagged on for everyone. I could see this easily going for $144.99 or something like that simply because it's an exclusive.
I don't think it'll sell out, with SSC really delivering this SDCC, people are already picking and choosing over their orders, this will get cut by a lot of people who would have ordered it for example if it went up in April or May for years past.