I recently read a TV Guide article addressing that and, as I recall, the producer or whomever said they'll simply disregard that certain things happened in the last season or its finale, in order to be able to most satisfyingly keep the spirit of the original run of the series alive.

Don't quote me on that, but I'm 99.9% confident that that's what I recall reading.

well I hope they at least address it in the show.

I think they handled it OK. Relationships end. Did the characters Will & Grace seem like the kind of people that could sustain relationships assuming a certain degree of selflessness needs to exist?

I've located the TV Guide article (winds up it's in the current week's issue) I mentioned earlier. Following is an excerpt from it:

"....(W)hat to do about that 2006 finale in which Will and Grace became estranged for 20 years? Well, it's scrapped. 'We never would have gone in that direction if we weren't ending the show,' [Max] Mutchnick [one of the series' creators] told critics in August. That means no time apart, no spouses and no kids. Will and Grace's apartment has had only a minor facelift, and Jack still regularly bursts in from across the hall, leaving things much the same as in the first 194 episodes...."

So a whole lot is now simply completely conveniently forgotten, like it never happened.

GAAAAAY!