X is the equipment button for Bumper Jumper.
so, seeing as Bumper Jumper is still there, it's most likely X
Posted by: rollingspartan
..sigh..must we again explain this to you guys..who do not watch the videos or read the news?..jesus christ..he clearly says in the video at E3 to press the X button..he even shows it in live action.. weird i know..but he does lol....yeah, but he was talking about Default controls.
this thread is asking about Bumper Jumper.