Well, before we get too excited, it's all very iffy. According to someone Comics Vine characterizes as a "not so reliable source," Billy Tucci is working on a Cass Cain-starring series for DC. My first thought was, "This isn't going to happen in a million years." My second was, "If it does, I'll definitely check it out because Billy Tucci created Shi, right?"
I had to ask myself because I wasn't too sure. I've never read Shi, but as a comic fan I've been aware of its existence for many a year. My impression has always been Shi as some kind of bad ass martial arts woman. After all, her very name is Japanese for "death." Always-reliable-and-never-wrong-source Wikipedia describes the character this way:
Shi is a young woman of mixed Japanese and American ancestry drafted into a modern-day "shadow war" between descendents of the infamous sohei warrior monks of medieval Japan.
Thanks, Wikipedia! Out of all the people who have written Cass Cain over the years or could possibly write her in the future, this immediately makes Tucci the most qualified. While I very much doubt there's any truth behind this rumor-- although it's possible Tucci might be doing this on spec with a mind towards pitching it at DC-- I'd like to suggest right now someone in a position of comic book power over there make this happen.