#1 and #2) Yes, kinda/sorta, lol. Mine had almost dissipated at around Week 12. Then I had a little mishap on a bike that resulted in lots of swelling and pain. Basically, I gave myself an MUA. That swelling is what's responsible for the cement knee. It is now beginning to dissipate again, just not quickly enough; hah!
However, OS tells me some residual swelling and tightness will remain for at least 6 months, more often 9 months and sometimes 12 months. It's the nature of the beast.
It can drive me nuts if I let it. I try not to let it. I tell myself I am stronger than it. It also means I distract myself as much as possible and try not to let it keep me from doing things I enjoy, within reason, of course. At 4.5 months, there isn't much I can't do, but often, have to limit the time of activities. I'm a "Slow Bender/Slow Healer, so you may experience a much quicker goodbye to all these aggravations.
3) My feet were killing me for the first 6-8 weeks. I blamed it on my newly, altered and awkward gait. I wore very supportive shoes to combat it and changed shoes often, sometimes several times a day. As my gait improved, so did my feet; phew! But, this does not mean you don't have plantar fascitiis; you may. If you are wearing shoes that you wore pre-tkr, I suggest you toss them and buy new ones because your old gait pattern is worn into those old shoes and it no longer works.
Howz dat?