In previous posts I was told to only believe 1/2 the words W says. Is this something that you guys would see as a breakthrough or a typical up/down....
Not sure I'd classify it as a "breakthrough," but I do think it's a positive sign. She's saying a lot of the right things, FFH.
At the end of the day, however, these are still, after all, WORDS. Only you know what your own personal "dealbreaker" boundaries are. If it were me, I would have to feel safe that there was no OM contact, and that she was sincere in "working on the marriage." The former I would establish thru a transparency plan (with at least one source of intel unbeknownst to her as part of my system), and the latter I could certainly be okay with it NOT including sexual intimacy for some period of time (6 mos. maybe?) But that's just me -- I'm pretty much a sexual camel anyway.
Built up anger and resentment can certainly be a barrier to sexual intimacy, especially for a woman. A good MC or FT -- preferably one trained in dealing with past infidelity -- can help you guys work thru this issue. If she balked at even trying THAT, I'd consider it a huge red flag, and would probably call "bullchit" on the whole speech.