There were three electrification schemes identified explicitly in 2016, East Kilbride & Barrhead, Kilmarnock & Barassie and Maryhill. The Scottish Government's recent Programme for Government namedrops the first of these. If they were progressing work on anything else, they'd have namedropped that too.
The 'Rolling Programme of Electrification' idea is still mentioned. From a political perspective I think we can see that it will continue along these lines, but slowly.
Maryhill is an attractive idea for a small scheme where there's not much capital available, but as far as I understand it would release only two DMUs, and for a route which is very far from busy.
I have heard almost nothing about Dunblane to Dundee via Perth, although I understand remodeling at Perth and significant tunnel works are required here. The Borders Railway seems unlikely to be a priority for now with just 2tph. The Edinburgh Suburban line is often mentioned, but given the big problems with the idea of a local service along it again would have limited benefits.