Honestly, I don't think they're that sure of the route they want it to take yet. Trains have been mentioned as one considered route was to take it through to a steampunk-esque era but at the same time, that is a lot of work they have to do and they don't want to make too many promises at this point.
I think the research is mostly expected to be in crafting as that is where new things can be produced. So, the plants themselves may not get much research - though fertilisation, irrigation, etc. may be researchable too - but advancing the production of medicinal salves/potions/whatever is probably the more significant research aspect of what you want.