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I imagine a fair few of you may already know about this, but for those of you who don't;
On the 15th of April, Gravity announced they were going to merge the IRO servers of Iris and Sakray. Characters from Sakray will be moved to Iris free of charge around the end of May. There are some limitations; A couple of MVP cards will get turned into special Old Card Albums that spawn miniboss cards, you'll be limited to 30 million zeny per character, etc. There are some other things like rank points not carrying over and homunculi most likely getting reset, but the main gist of it is that Sakray's characters are getting dropped into Iris. For those of you with Iris and Sakray characters, make sure the total number of characters on the combined servers is less than nine, otherwise there might be some issues with character overflow. Sakray itself is apparently going to be changed into a genuine test server.
Check the official website for more details.