A leaked internal T-Mobile document obtained by TmoNews suggests that the unannounced Samsung Hercules and the HTC Ruby, which we brought you exclusive details about earlier today, are set to launch on October 26th. The Hercules is expected to be T-Mobile’s version of the Galaxy S II, which Samsung will officially announce on August 29th during a press conference in New York City. It will of course sport a dual-core processor, Android 2.3 (Gingerbread), HSPA+ support, a Super AMOLED Plus display and other high-end specs. The Hercules will launch as the more powerful successor to the Sensation. It is equipped with a 4.3-inch display, a dual-core processor clocked at 1.5GHz and it will be the first smartphone to support the T-Mobile’s 42Mbps HSPA+ network.