In the games data, there are unused sprites of "weapons unlocked", where Mega Man is holding his new weapon.
Blade Launcher acts similarly to Triple Blade weapon from Mega Man 10 with three exceptions. First, blades from Blade Launcher can`t be sent in "air-to-surface" pattern (it is when blades flies in downward-diagonal manner instead of upward-diagonal), which is possible with Triple Blade. Second, Blade Launcher sends shuriken-like blades, when the Triple Blade sends knife-like blades. Third, blades from Blade Launcher flies much slower, than blades from Triple Blade.