Yes, the leaked builds of v62 do feature Tabs and AutoForms Complete, enabled via the Debug menu.
The tabs work quite well. They are not as aesthetically pleasing as the tabs in Chimera, but they are more functional, as each tab has a close button to the left of the text. Quite nice.
However, Tabbed Groups, one of the main reasons I use tabs, are not present yet. Time will tell if they will be implemented at all...
I haven't been able to get AutoForms Complete working, however. But the fact that the debug menu shows it means that it's being worked on...