The Nikon rebates will be renewed next month, but many of the high-end lenses will not be included (end June 29th).
The current Fujifilm rebates will not be extended (end June 29th).
Those Canon savings will expire on July 6th.
Sony's offers are valid till June 29th.
Tamron lens savings are set to expire on June 30th.
Sigma rebates are valid till June 30th.
Tokina rebates are valid till August 31st.