Blocks or Construction Elements?

Yes indeed, the PlayerPlaceBlockEvent and PlayerDestroyBlockEvent will be removed (because the new version treats all blocks as construction elements), instead these situations will be covered by the PlayerPlaceConstructionEvent and PlayerRemoveConstructionEvent / PlayerDestroyConstructionEvent / PlayerHitConstructionEvent

Quote from yahwho

red51 How will the getMultiplePlacementDirection and getMultiplePlacementCount be converted?

We've been thinking about a separate event for "multi placement", but we're not sure if that's a good idea. For now there will be new getMultiPlaceRowX(), getMultiPlaceRowY() and getMultiPlaceRowZ() functions - in the new version, it will be possible to place multiple elements along more than 1 axis, so we need separate methods for that (e.g. the player could place 4x4 elements along the x/z axes)

Quote from yahwho

Edit: PlayerHitConstructionEvent is new isn't it?

Oh, actually it was already there, but it was called PlayerConstructionHitEvent before. We've renamed it to make it more consistent with other event names