Houston (Texas) Airport Marriott at George Bush Intercontinental (IAH) update.
Now an M Lounge (for more than a year, I believe) with 24-hour key access.
Website also shows that hot buffet breakfast is served Sat/Sun, although I've always checked out Friday morning so can't vouch for accuracy.
From the website/room details:
M Club Lounge lounge access
Open: Mon-Fri, Open: Monday Thru Thursday 6:00am-10:00pm Friday 6:00am - 12:00Noon, Sunday Open 5:00pm - 10:00pm
Closed: Other, Closed: Hot Breakfast Buffet served on Saturday and Sunday Mornings
There is some inaccurate information, leftover from the old Concierge Lounge days, such as:
"Continental Breakfast" -- they have a full spread + food cooked to order
"Honor Bar" -- they actually have servers who can get either food or all alcoholic beverages available from the adjacent bar/restaurant "Flights".