The new Sigma 24-150mm f/4 DG OS HSM lens is now in stock for Canon DSLRs. Check it out here at B&H Photo.
B&H has the Sony A7R in stock in limited quantities. Check it out here at B&H Photo.
The Canon Rebel SL1 is now in stock and shipping from major retailers. Find it at the links below.
Canon Rebel SL1 (b0dy only) – B&H Photo | Adorama | Amazon
Canon Rebel SL1 w/ kit lens – B&H Photo | Adorama | Amazon
B&H has the new Canon Rebel T5i kit in stock with free shipping. Check it out here at B&H Photo.
Adorama has the new Panasonic GH3 in stock and is now shipping them out to customers. Check it out here at Adorama. [Update: It's now shipping here from B&H Photo too.]
(Note that there’s still a backorder message on the page at them moment, but that should be removed as soon as the inventory in their system is updated.)
The new Nikon D5200 is now in stock and shipping in the US. Check it out here at B&H Photo and here at Amazon.com.