Hi,
We've gotten rid of all the top links, as they weren't deemed worth the "above the fold" real estate they were taking up.
The forums indexes ("Article topics", "User topics") are still available, and one can still directly go to them - but we're not linking to the forum homepage, or to other links we used to have in the top nav bar, with the same prominence.
I'm not sure what you mean by "the list of forums also appears changed" - we've done no change recently to the forums layout, list of sections, or anything like that.
Hope this helps!