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This thread made me just go check my Citi and mine is the same as well. 7.9%.
I am afraid I don't check my cards very often!
Does seem like you have been hit with a rate that usually comes when something is wrong.. like a late payment, etc.
Doesn't answer why they raised you APR.
If you opt out it may have effects on your FICO scores, either immediately or eventually. Depends on whether you have balances and whether you have a balance on this card. That may not be a reason not to opt out. Opt'ing out may make a great deal of sense economically. If it makes the impossible possible or saves you enough money you may not have much of a decision to make.