Upvote:3
That microform collection appears to be published by Brill. Their website says that the searchable CD-ROM index is available for free, and they also have a 60-page guide in PDF format free for download. The collection itself is extremely expensive, which explains why only a handful of top research libraries in the US and Europe seem to have it in their collections.
I do not see any evidence (in English, I don't know Russian) to suggest that a digital version of the actual collection itself is in the works, but I don't find this very surprising. Digitizing such a huge collection of data would expensive, and the target audience would be small.