All I know it that it is advertised as a "limited edition" on Larian's website, so if you definitely want it then obviously there's a risk August may be too late if sales pick up as marketing gets underway. That said, I'm not aware that we have any information about how close it is to selling out, or even how many editions are planned. Not sure if someone else might recall this info being mentioned.
I guess you could try contacting Larian support to see if they can tell you. Contact details are on the Larian website in the Support section. I genuinely have no idea if this is information they could share.
