Here's what I know about a few items crucial to my workflow, as of this date:
Hasselblad Flexcolor software, quoted from an email response to my query:
At this time, FlexColor is not compatible with the Snow Leopard operating
system; therefore, please continue to use Leopard or earlier operating
systems. I can confirm that initial test [sic] have been done and we hope to
support it soon....Please continue to check our website in the coming weeks regarding
compatibility.
Epson 3800: the Epson website
here, under the "Detailed Specs" tab, "Operating Systems Supported" section, lists Snow Leopard as a supported OS. Nothing more specific than that.
Epson V750 Pro scanner:
Support page lists TWAIN Driver and Epson Scan software version 3.25A (12552) as OS X 10.6.x "compatible".
Nikon Scan software: nothing on Nikon's site I could find. I have heretofore used Nikon Scan to drive my Nikon 9000 because its interface is simple and clean; but given Nikon's past stated intention not to continue updating Nikon Scan, it looks like I may be shelling out some $$ to switch to SilverFast, unless NS just happens to work. I've never liked VueScan's hideous user interface, but I may have to swallow that cup of bile instead, given its much more attractive price.
SilverFast AI Studio: From a
forum posting by one of the company's developers / owners:
...as we now drive the Nikon scanners natively by NOT using the outdated Nikon MAID Interface we will be supporting the Nikon scanners with Snow Leopard !
We are quite sure that it will only need small adaptions / changes to do so if they are needed at all....