Yeah I would wait it out if you can and see when Samsung announces their new devices. I doubt it will be during MWC in late February. They'll probably do their own press event in March or April.
But as far as what the new S4 or Note 3 will look like or have under the hood, it's really pure speculation because nobody has a clue. But I think it's safe to say one or both devices will probably have the new Exynos processor.