Ok whats going on here? Are DC intent on getting rid of its main two charecters right now? Batmans gone all Marty McFly from some omega beams and Supermans gone too?
Superman stopped an attack by (another) Brainiac and ended up finding the (shrunken) lost city of Kandor. Releasing it on Earth near the Fortress of Solitude, it grew to normal size, complete with 100,000 Kryptonians.
As the Kryptonians began gaining powers under Earth's sun, they had a number of problematic run-ins with humanity. Including killing several police officers. This turns the humans against Kandor. Because of the murder of one of their leaders, the Kryptonians launch the city from Earth, growing a New Krypton in Earth's orbit on the opposite side of the sun. Humanity has banned all Kryptonians except Superman from Earth (which is a problem for Supergirl). The New Krypton book follows Superman's adventures.
Superman decides to live on New Krypton to be with his people, and keep an eye on them (especially since Zod leads their military). Because Superman was able to free Mon-El from the Phantom Zone, Mon-El has taken Superman's place as protector of Earth while he is gone as a favor to Kal. So the Superman book is about Mon-El now.
Action Comics follows a pair of Kryptonians, Flamebird and Nightwing, on Earth who seem to be tracking down rogue Kryptonians on the planet. One of the Kryptonians, Nightwing, is actually Christopher Kent. Superman's adopted (and Zod's biological) son.
I heard there are only a few JLA members remaining?
It's second stringers now, trying to live up to the example set by the big three. Black Canary leads John Stewart, Firestorm, Zatanna, Doctor Light, and Vixen.
Ok.....DC has changed a lot in 2 years, wow. everything seems topsy turvy.
Blackest Night might bring about a ton more changes. There are now 8 Lantern Corps in the universe based on the 'emotional' spectrum:
Green based on willpower
Red based on rage
Blue based on hope
Orange based on greed
Violet (the Star Sapphires) based on love
Indio based on compassion
Yellow (Sinestro Corps) based on fear
and Black, based on death
The Black Corps are bringing the dead to life throughout the universe.
A couple of dead heroes you might not know about include the Martian Manhunter and Aquaman (Bart Allen and Superboy are recently back from the dead).