The ILS availability is currently LOC only on 24 with the relocated GS for 24 and the new ILS system on 06 being promulgated via AIRAC to come into service on 8th March, when the new IRVR, approach lighting and OCHs etc. for both runways also become valid. In reality I think its all been flight tested so its actual availability date might be brought forward a little by NOTAM.
I believe a recent easyJet press release descibed SEN as the first new airport to be built in the South-East for decades and I suppose that description isn't far from the truth when all the renewals/developments are taken into account. Virtually all the infrastructure is new with the exception of the original runway strip and that has been resurfaced with centreline lighting and a new drainage system etc. installed.