He talked about haswell and "4570k"... So yea. Please start reading...
Torn Mind... It will not die soon, Steamroller will be out on AM3+ socket and Excavator will be also on AM3+, maybe they make AM3++ socket because of DDR4 even thought DDR3 will still fine.
Kaveri will support onboard GDDR5 or DDR3/DDR3L depending on what motherboard you choose most likely or it will support both.
DDR4 will be expensive when it launches, it will be affordable maybe in 2-3 years when it become's a standard for all newer PC's...