Yes I would get there early. I don't know for sure if there are issues yet, but I know someone mentioned TSA issues at another airport recently (don't recall which one)
Not IAH, but flew Hobby - Midway - Buffalo and Buffalo - Baltimore - Hobby this weekend. I was worried about air traffic controllers with it being a holiday weekend and connecting in busy airports. But zero issues or delays.
I went through IAH Terminal C about 4pm yesterday. Only 3 people ahead of me in the pre-check line. Regular security line was really short also. The airport in general seemed much less crowded than usual.