@Skittlesdcat1
If you go click on your avatar/icon on the top right of the new-style home page, a column will open showing your avatar a little larger, plus links to your Inbox and other things. Click in the empty space to the right of your avatar and then click the gear icon. Choose "back to my collection". That takes you back to the page that shows all of your albums. From there, you can select "Badges" (near the top) or "Badge Central" below that. Both of those will take you to the Badge Central page. You can also choose Find a Badge (which is still easier for me to choose a new badge to work on than the new way). On the Find a Badge space, you can still see badges for sale that will retire soon... so much handier than the new challenge central.
I use Badge Central all the time to keep track of badges in progress, although it doesn't show marathon or GOTM badges. However, it looks like it may have changed since last night... now it's only showing the two weekly (Wednesday) badges and two M&M badges, instead of the several badges I have activated at this time. I hope that's just a temporary glitch and it will start showing the rest of my active badges like it usually does.
Hope this helps!