Some feedback was taken into consideration and more sources added. The view on whether at this stage it is too soon to create an article on a film currently at pre-production stage is a subjective one; subjective arguments, derived from personal opinions like the one you have expressed, do not constitute official guidelines or policies unless stated otherwise (e.g. an official guideline stating and clearly informing at what stage of creation any films/projects/books, etc  can be added; such official guideline does not exist). As such, I cannot counteract that particular view with a factual and objective statement. Conversely, the argument presented by you should be presented not as a clearly set guideline and final reality, as it was, but rather as for what it actually is: a personal perspective on a specific matter.  

 If the article is to be nominated for deletion, at the very least, the actual reasons behind it should be made clear and transparent and not camouflaged as something else seemingly more objective. On a last note, when communicating matters such as these, or any matters whatsoever, sarcasm and belittling comments are inappropriate and have no place when expressing rational and civilized views. This is an universal guideline, whether we are in the context of online communications, face-to-face or of any kind. I am presuming that one of the main reasons for patrolling and contributing to Wikipedia in the manner you have chosen is to combat inappropriate language or usage, as much as it is to ensure quality of content and a project / community to be proud of. Emulating one of the characteristics to be patrolled, communication by means of derision and sarcasm, is not the way to achieve such objectives.  

 Best regards.