Republican pickups (though not all affect redistricting, of course):
Alabama House and Senate
Colorado House (possibly, NCSL still has it out)
Indiana House
Iowa House
Maine House and Senate
Michigan House
Minnesota House and Senate (WTF?!)
Montana House
New Hampshire House and Senate
North Carolina House and Senate
Ohio House
Pennsylvania House
Wisconsin Assembly and Senate
Oregon's House looks like it'll be thin, it's currently 28-28 with 4 seats left. The Oregon Senate is possibly going to be a 15-15 tie.
Amusingly, it looks like the Republicans are down to only one seat in the Hawaii Senate.
"Dems are likely to hold the MI House"
lol
Really I am not surprised. With the GOP gaining double digit numbers in so many states, I had a feeling MI went to complete GOP control. I had a feeling that with the wave, Snyder's margin, and Dem problems both nationwide and in the state, the Dems were in trouble.