Any bedrock placed by the player in creative can be broken in creative. In addition, you can break all but the last layer of bedrock generated naturally. The last layer is all the stands between the player and the void, so it will not break even in creative mode.
Bedrock can be broken in Creative, and breaking the bottom layer in either dimension is pointless since all there is is a black/red abyss on which you walk instead of fall into.
http://www.minecraftforum.net/forums/minecraft-xbox-360-edition/mcx360-discussion/2016459-how-do-you-break-bedrock-in-creative
Any bedrock placed by the player in creative can be broken in creative. In addition, you can break all but the last layer of bedrock generated naturally. The last layer is all the stands between the player and the void, so it will not break even in creative mode.
If you want on the Nether roof...Ender Pearls.
Stay fluffy~