Will SSJ God Goku come back?

He will most likely come back eventually, if not soon. Most sparking units that have some hype behind them feature in many banners close together. SSG Goku especially, giiven that her doesn't have very good tag members, and will probably come back when more "God Ki" characters come out.

He might, I smell a God Banner coming soon with blue saiyans, Whis, Beerus, etc.. That tag need more units indeed. Save your gems