Will there be anything about the new one that even matters for your purposes?
Rumors suggest the new models will have reduced bezels. One other rumor is for a model in between the 12.7 and 9.7 with a smaller bezel making it about equal to the current 12.7 except with updated specs and a smaller footprint. Along with the new models you can expect, although it may not actually materialize, discount deals on the older models. In 2017 there has already been a new 9.7 released in a non-Pro model.
There is also the Apple Refurbished route. They all come with the same AppleCare and are eligible for the extended AppleCare like a brand new product. I have purchased several refurbished products from Apple and have not had a problem FWIW YMMV etc.
I purchased a new 12.7 Pro for art. A delay in the decision concerned the expense and not having any other use for an iPad. Once I had it I discovered ways to use it outside the art context. It turned out to be more useful than I imagined and I ended up purchasing a 9.7 Pro as well, the 2nd mostly because the 12.7 was just too large to carry around but also because I use an app that you can create a panel of buttons that correspond to key commands. It means I can push a button with my free left hand which might have required multi-step keyboard shortcuts or the use of a mouse or tablet pen (both relatively distracting and workflow disruptive). I prefer the response of the 12.7 though. It may have a slightly slower processor but it feels a little more elegant when using the touch screen. Plus you have one less layer of keyboard truncation. BTW typing with the software keyboard is amazingly effective given what it is.