From Breaking Dawn Relevation 

 Summit officially announced the first band on the soundtrack of the Twilight saga: Breaking Dawn part 2 which is (Passion Pit )

now thanks to Breaking Dawn Relevation & JackMorrissey 

we have the name of the song by passion pit :-

the name of the songs is: “I Think We’ll Be Alright”...and this the song was played when bella opened her eyes in BD part 2 

 thanks to Spunk -Ransom