Teddy Greenstein of the Chicago Tribune notes,

Big Ten deputy commissioner Brad Traviolia has stated there is no 8th team from within the conference on the horizon right now, despite years of rumors of Illinois or Nebraska possibly moving up from club status.

However, Chris Peters of CBS Sports is looking outside the box to find a potential 8th team for the Big Ten:

The Big Ten probably isn't done adding affiliates for hockey

While adding Notre Dame is the big get for the Big Ten hockey conference, there is more they'll have to do. A seven-team conference isn't a ton better than a six-team conference. That's why we might see another addition prior to the 2017-18 season when Notre Dame's affiliation begins.

The most likely candidate at this point appears to be the brand new program at Arizona State University. The Sun Devils just completed their first year as a Division I independent and are reportedly weighing two options for their conference affiliation."

Peters also spitballs that the Big Ten could look to lure a program like North Dakota from the also-new NCHC. Minnesota and Wisconsin both have longtime rivalries with North Dakota, and the program has a long, rich history and boasts one of the bets home rinks in college hockey.

At any rate Notre Dame's move (along with Arizona State's recent move to D1) states that realignment is not yet done on the NCAA DIv 1 landscape, and that the Big Ten is not afraid to continue shaking things up.