Remove the pin it button

That’s not possible yet, but it will be possible once Jetpack 3.6 is released in a couple of weeks. You will then be able add the following code in your theme’s functions.php file, or in a functionality plugin, to disable the Pint it button:

add_filter( 'jetpack_pinit_over_button', '__return_false' );

Until then, if you don’t want to see that Pin It button on hover you’ll need to go to Settings > Sharing in your dashboard and switch to another button style. Only the Official Pinterest sharing button adds that feature, so you won’t see if if you use “Icon Only”, “Icon + Text”, or “Text Only” buttons.