As Talla Radar says, some info is not in the public domain.
However, that which is:
1. Scottish TMA Approach Control is still done at the airfields. There are no immediate plans to change this.
2. Numerous sources at the Centre including Lowther Hill, Great Dun Fell, Tiree, Belfast, Kincardine, and Glasgow (when complete). Mosaic (MRT), composite (2 sources) and single source are all available options to controllers there.
3. Kincardine Radar fills in the gaps not covered by existing sources or affected by the wind farm. See press release here:
Kincardine Radar
4. The replacement is part of the NATS Radar Replacement programme. I suspect it will be available in the new Centre, as with other NATS radars.
No idea of completion date, but they normally take about 1 year to come in to service once work starts.
5. No TMZs in force now. None planned as the windfarm problem was solved by feeding Kincardine in to the new Centre.
6. No changes in the pipeline.
Cheers