6 was already leaning heavily in the direction of embracing the history of the whole franchise more than any of the other films. I feel pretty certain that 7 will probably continue leaning in the "full circle" element of it all and probably will be positioned as a culmination of sorts for the franchise, especially with Sidney taking center stage again. I kinda doubt this will be setting up Scream 8 with Sid and Gale, though you never know I guess...
But yeah to me it's not terribly surprising at all to see returning players. And to me Scream is a giant slasher soap opera.