Yay! I was hoping Silver would get the next book. If the Architect of the Consortium manages to take out her grandmother, then Silver will be the new matriarch of the Mercants. Whether or not the plot succeeds, he/she will incur the clan’s enmity. And Silver’s. As for her man, the first person to pop in my head was Malachi.
Other candidates: Remi would be fun. A lot of people are suggesting Bo, which would be interesting, but I really think he will end up with Miane. And I think Tanique will be with be with the girl they rescued in Allegiance of Honor. Can’t remember her name off the top of my head.