There may be a mention of the Shadowsouled in aSFOS, but given that they really only use older Minbari designs, there will likely be no specific ships creditied to them.
That said, there will be a complete system for using "Shadow Tech" or "Vorlon Tech" to modify existing vessels. That will allow people to create any hybrid ship they want. Think it would have made more sense for the EA to make a Shadow Hyperion first? You'll be able to crank one out in minutes with the new system. That's a promise.
As for other races, if I have materials on them, they'll be in the book. Nothing further on that yet.
Take care,
-August