As you all know, this wasn't possible in Crysis 2, and it was a source of great frustration for me.
I swore that if Sprint+Reload was confirmed for Crysis 3 (alongside the already existing plethora of enhancements, that is!) then I would pre-order the game.
Today SDub had an extremely pleasant personal message to send me over gamesas: He had obtained a reply for my question. Sprint+Reload IS indeed possible in Crysis 3's Single Player mode!
This is the result:
THANK YOU SDUB AND CRY-DUDES!