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You will be notified along with the rest of us when there is an update available. I don't know where you got the information that there was an update due out today. Adobe never makes those kinds of announcements. You will just have to wait and see like the rest of us. It could be today, or next week, or in three weeks, or.....
Maybe it is maybe it isn’t, you’d have to talk to whomever gave you that advice to see if it was still valid. I have no idea and if I did I couldn’t say one way or the other due to a legally binding non-disclosure agreement about internal target dates and slippage or not of such.
Before LR comes out you can use the DNG Converter 8.7 RC from Adobe Labs to create DNGs from your NEFs and work with those DNGs in the older LR.
Native Lightroom support for the D750 was added in the Lightroom 5.7 update released this evening.