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They would have all of their powers and abilities (including fleets, titans, ground units, special character, etc.)
All other races have been destroyed/corrupted/devoured however for the purpose of this battle these other race’s powers/abilities should not be included (e.g. no Chaos Tau Riptide Suits or Tyranid Bio-Titan Squiggoths)
Main points to consider:
Would the corrupting influence of Chaos have any effect on Tyranids (remembering and animals and inanimate objects such as Titans can be corrupted)?
Would destruction of all other races weaken the Chaos Gods, effectively “starving” them of new souls/emotions to feed off?