I just saw the demo for the upcoming Starcraft 2, and to my amazement i saw this Protoss Mothership with 3 abilities namely the Planet Cracker, Timebomb, and the Back Hole which was supposedly for warping out air units. Then the next day i just found out that the Black Hole ability was removed, and as a result, players can now make more than one mothership as opposed by the earlier demo i saw where a player can only use one mothership at a time. just wonderin' ;-)