When it comes to expressing that something is "in store", there are a number of alternative phrases to choose from that can lend a bit of variety to your writing or speech. Some possible synonyms for "in store" might include "on the horizon", "upcoming", "anticipated", "future", "forthcoming", "coming down the pipeline", "yet to come", or even simply "coming soon". These phrases all carry a similar connotation of something that has yet to occur, but that is nonetheless expected or promised to happen at some point in the near future. Depending on the context and tone of your communication, any of these phrases could make for a suitable replacement for "in store".