It is indeed interesting news, however--and I'm taking OP at his word that it's true since I haven't verified it. I don't think there are any other publicly-traded exchanges of any type, or at least I can't think of any. As far as whether their stock is worth investing in, it depends on how profitable they are. I've never seen any reports about that (not surprising since they never had to file any such reports), but I bet they make a pretty decent chunk of change unless they somehow have a lot of overhead.
This will definitely be a stock that I'll put on my watch list once they finally get listed. Betcha there'll be a ton of buying on IPO day.
a) They are not conducting a IPO