I think it's safe to say
That the new Son Of Blob DVD won't be coming out.
It's release date has come and gone without a release. Best Buy's site for the DVD changed its name to Beware! The Blob, which was the title of the previous DVD release. It still lists the release date the same as before. It says it's backordered 2 to 4 weeks and it has said that ever since the release date, which is now more than a month ago.
There's not even a web site, apparently, for Thrill Kill, the intended distributor of this new DVD release.
So, I think it's safe to say that there is no new Son Of Blob DVD forthcoming.