The leaked spells in the code from Valkyrie are absolutely the same as the spells Dawnbreaker has, they just renamed it last minute and gave her a hammer instead of a blade for whatever reasons.
Proof:
Celestial blade is now her 2nd spell, Celestial Hammer
Lumious blade is now her passive, Luminosity
Valkyrie healing touch is now her ult, Dawnbreaker healing touch. (I know in the game it's called solar guardian but in the game files it's called Dawnbreaker_healing_touch
Here's a list with some more spells she could've had. Next hero to be released is Puppet Master.
Source: https://www.reddit.com/r/DotA2/comments/mpm1wl/valkyrie_dawnbreaker/
