I've got to disagree on T3 vs. the old T2. Especially in its last few years, T2 was an absolute dump, with inadequate HVAC, terribly overcrowded gate areas, inadequate restrooms, and awful concessions. The new T3 is really nice and it's also quite compact (especially on the UA/AS side, with slightly longer walks on the DL side). So much better than T4, which is one of the worst major airport experiences in the country IMO. The only real negative for the new T3 is you frequently get longer taxis, since most flights use the southern runways (7/25) for arrivals and departures, whereas the UA gates are on the north side of the airport (as at LAX, DL snagged the best gates for getting in and out quickly).
I did see signs of work (including a big new banner) outside the new UC last week. Have my doubts it will open before my UC membership expires in October.