B&H Photo has let us know that the current Canon USA rebates on Speedlites and lenses ends tomorrow, March 29, 2014 and will not be extended. They also mentioned that there are no other rebate programs planned for the near future.
The current rebate program is of the mail-in variety and is open to anyone with a USA mailing address.
See all the qualifying products at B&H Photo | Qualifying products at Amazon
Canon USA Rebates at B&H Photo | Canon Rebates at Amazon