Va a ser que no. The Spanish periphrastic future construction as refutative and assertive marker KU Leuven
This study seeks to gain a better insight into the origin and expansion of the construction (lit. goes to be that YES/NO) in Peninsular Spanish. We argue that this construction derives from the use of the periphrastic future construction in a pseudo-cleft sentence whose subject is a deictic element or an element that conveys the speaker’s attitudinal assessment of the propositional content expressed in the attribute, a complement que-clause. ...