MM2 and FF were nothing like the originals either, thats what Tome of Horrors was for.
A quick checklist of what was in Unearthed Arcarna 1985
Comeliness - ugh!
Subraces of dwarves, elves and gnomes - done.
Cavalier - done
Barbarian - done
Druid - done
Thief Acrobat - done
Changes to the Ranger - done
Weapon specialization - done
Plate armor and buckler shields - done
Hand crossbows and other weapons - done
Heap of new spells - done
Cantrips - done
Traveling spell books - not needed
Heaps of new magic items - done
Weaponless combat - done
Non-lethal combat - done
Non-human Deities - done (overdone in UA)
Pole arms - done (overdone in UA)
Conclusion: Even if comeliness makes a return, a new Unearthed Arcana will not be a rehash of old stuff. They will probably still find room for more changes to the ranger though.