It is meant to be on every night throughout the anniversary year (ie up to mid April). However, someone on here, name escapes me, said they emailed DLRP the other week to double check and they were told it's only confirmed every night until the end of the year . No further info on after that date? Odd, as another person on another forum said they were emailed that it was on the whole of the anniversary year?
It is definitely advertised in the new Winter season brochure so should be safe with that.
No-one knows what will happen in the future with it - i.e. next Spring as the thing is, it is much lighter until late at night. It would then mean having extended opening hours once again during that time. Whether DLRP will do this - who knows?
Dreams won't be leaving DLRP - it will stay for a long while (huge cost of infrastructure/programming etc), but whether it stays a nightly thing even in low season....